Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f171805c6dcb91c…

MALICIOUS

PDF

75.4 KB Created: 2021-07-08 09:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8eae62bff0e6c3376e7c20e34a56f6f8 SHA-1: e9cc38c4d864bb0203a539522a1da949c5724c55 SHA-256: 4f171805c6dcb91c293feb3eb044dbb2273c6e9ed118a1c836355bfa2a4b1ed0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://oniceh.ru/uplcv?utm_term=just+a+while+ago PDF link annotation
    • http://sam-global.info/files/file/govejogageno.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160774c1909fb3---gudexapigamovinide.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c64ddd27bdb47e03468d7ea688fff7aa/mujuzafafenipusetazojo.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/buparitoji.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/39779135bfc48218c39e48ea8ead06d0/43677300865.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160933fe603f77---dubafiluzig.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf728dfc2f---marakagelufotov.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607046981b6ac---gofazomeja.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/ridugafabodusixibibolak.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/7306b2e08e962ca7b51576036fd0b84e/vipejakarizagabusifabiwab.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/892ad4554e4a9f54aa4c6611ddfa4a23/pufisejeliwexegovenapebo.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/mibamadu.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/12118866605.pdfIn PDF document text
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/mewovudawajofudamati.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e81c9f198dbd59aaff3d3d4322a34833/kiduwukarajorewujago.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/6e17619cbdac3107578a257edd74a88f/guvejavilizirizepopute.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e34e7af0d8---55373336290.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/35hg02uk2502e2ktcg2290qvsh/bakifuripasemonetaj.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/u5qtk5hc8bf3sleqv4iaq5sntl/78830902116.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/16326204.pdfIn PDF document text
    • http://stromzeleny.cz/file/puxovoluwapogudibero.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_off0000c344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5B 10360 bytes
SHA-256: dea5f0c8a12d9427468dee7997182bbdaded83673e7e87055910f357771b84a7
font_02_sfnt_off0000f300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF300 17544 bytes
SHA-256: 3d20029e38836cf1dcda853d7876d018150f443c399ba26d4ba270967b4f0b03

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