Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb7b13999574c05…

MALICIOUS

PDF

80.7 KB Created: 2021-09-01 21:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 64cd6e51bb100e9d7f372a054469f594 SHA-1: fe729eea118cf55c10f043ea58cdf4634324c969 SHA-256: 9cb7b13999574c0526a5f1efffcf6df44fa7ba8ba4d9ce223950a50fe5c8462c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised CMS upload directories, identified by heuristics like PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://studiotecnicopetrillo.eu/userfiles/files/geside.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/2ah6b9ub2f9urqf50gf8ohejir/woxenawenelepekuwasusap.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/fa7c7c8ee007452568a4993568246208/99097239129.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fca926039---18018655819.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/hq815ufs2p0op5238ut2btbu4q/31297329308.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f92a3d079---70009941134.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cb294acff6f---20676489467.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/33cadc3922d39690de9c5b2ba560d986/76011572935.pdfIn PDF document text
    • http://bscartridge.com/pic/19797324697.pdfIn PDF document text
    • https://huanghecables.com/d/files/79307021056.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/pinebepowuwutunifel.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ed63683c6---43952438895.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/batuvelibofuwo.pdfIn PDF document text
    • http://rld-carbon.ru/file/21087831635.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/59798465843.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/14015418260c42c0b0619e.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/96006657837.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/gepuwisawozutut.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/simepi.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112ffc9e1b76---wokoroxadefe.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/wetixatupediwagivereta.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/folebumenoku.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/42424714228.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/temilonerijopag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=bed+plate+in+enginePDF link annotation
    • 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_off0000d800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 10232 bytes
SHA-256: 672d950ad75f9673645778afedb3d8c00fd31393c91bf89cab7cd046e4a3d847
font_02_sfnt_off000106ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EF 17404 bytes
SHA-256: 1bfe352ae9bb78223448c5e4f1743e7ebf25ddc7ed24fb4cc4ebdc70f1ff8b0e

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