Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d6913d12691797…

MALICIOUS

PDF

103.5 KB Created: 2021-07-04 10:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fd47dd7903b297c8ef04ad4aba938c83 SHA-1: 50a914957b5cdb5601c3152b4395f207a87f4b3f SHA-256: b8d6913d1269179750a110eca876fa6a7f2b342430e65f71f8f6680f22e9ae2c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of malformed streams and external URIs indicates an attempt to exploit vulnerabilities or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=writing+a+eulogy+for+husband PDF link annotation
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/b21c811e0340d4b78f971e1400b9f639/bizetuxomebuzividi.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160887ee9cda8d---zabofivofetivamefape.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/s22orjl6osdqtig6himmibletv/bosukefaguxivofip.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/1a73f200dfaecca48abb5e8a4b3c7b86/zemavivukuferifikat.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/1724a740961294ccb147e894a15ac8de/72272972905.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/76769d3ea264c7247f34763a80f97276/71987687418.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/53692098771.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/9qnso5qvrdg7hgsqnp2r1k62l6/zarikibojekotupasavilade.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/22057873651.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/51868370735.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a7f06ca6---94075167388.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/27dc6f5e7bb997352a6866ef548e140e/mowikogipobox.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/5f442510f5da4a20254c06db6fb2da97/37114522402.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/d856133f9223f5bec2218f9c37f7462e/meluwimitolilexo.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609704741cf36---xijogiboditisawudobunoku.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210622_DE1073120C9776E6.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ec910c5e86a44336358b039e4a0bf5f6/22997928999.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073c7ccdb9b6---91795810809.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/8ea227e4735b389f8eb03f507c354165/bifuruzutesigasazawamuki.pdfIn PDF document text
    • http://exantusfamilyreunion.com/clients/9/96/968554593547eb574606130639276270/File/wikawajowutasumizo.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/11755860978.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d4b8d44c---41222131439.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/c9b499nm0frg34hmkol79ki558813tgt/41702151439.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd341ab7fd---44705588535.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/83952087476.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/cc3faaecf3b0cd41706f56e313e42a7e/kalovunafoxarolelonix.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/vedafivezinomebusenunojit.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AF 10980 bytes
SHA-256: 57d9f897ef995f5181fb2faf0d457e36f871e99d395ddc115fa5c53f26c91f75
font_01_sfnt_off00014ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE8 16856 bytes
SHA-256: 54574b81a18bce4552d0b0316a169d38e12cd2184631d09fd5ef1a5ba9b2e66e
font_02_sfnt_off000178af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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