Malicious PDF — malware analysis report

Static analysis result for SHA-256 77146570947c2135…

MALICIOUS

PDF

82.0 KB Created: 2021-08-30 13:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1891d9e8f81d86a8623a2f30e3e043df SHA-1: 0911f11e2edb5710eb4def2b7652b40aeb076b62 SHA-256: 77146570947c21356c13bbd9930c2b684395b4d90f292034bac04da0ed48c4fe
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. It contains numerous external URIs and links to compromised WordPress sites, suggesting it functions as a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is used to distribute links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crewmak.ru/uplcv?utm_term=steal+you+away+book PDF link annotation
    • http://dongzzang.com/userfiles/file///sujujitikotixategovid.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/86362424515.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/19235238841.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/96569324419.pdfIn PDF document text
    • http://iltorg.ru/upload/file/bevelabilizonenu.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/59d7h87ti2sh7d1i1keet0r3l5/55146107303.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3764ae6f2---tujug.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/mudelagivelimagirut.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/jhpr1kjqii34duiro258g2bio6/83883386257.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216223646481.pdfIn PDF document text
    • http://santeh.md/img/files/97613574119.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/93533487091.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073eed5c818f---18926379187.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/roputifepem.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/95262545892.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/6434012140.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/81322936705.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/37828448747.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/2e5f685c06924301de1747f99e9b59dc/mixuxuzaraxidazujafusat.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/refeg.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/janam.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/11ajn2prvdacmgh8tc2lqvh6aq/zepepimivatimanesimov.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/d3e77157f41ce52fbc4d5d1a553d8e62/rilawinun.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_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57F 17608 bytes
SHA-256: 43e69e8613f2a2c1d9835ef7492351a7ddb54b3062e1c6fdfd35ca0872d49281
font_02_sfnt_off000122ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CE 10244 bytes
SHA-256: 96390ccb81e75e009b1a3c101ff53cb665f696155f7584ef21ed0d49fd6580d6

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