Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f71edaee9cab178…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 11:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 305f850be9b11caa9875e073eb9f412b SHA-1: a67162e49e05817983b9257f3dcf0ec1ee42f3dd SHA-256: 5f71edaee9cab1784bc4dbb5b62ea1681e9307bbe78c47845fcf29a41e5ffe8e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous links to potentially compromised or disposable hosting sites, coupled with heuristics indicating a link farm and urgency lures, suggests a phishing or scam campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a downloader or redirection mechanism, likely leading to a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/wuvarasuvesuf.pdf In PDF document text
    • http://baigeleather.com/userfiles/file/kobimejosapofamen.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/kegevezonopixejisolol.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/t7e87vnpcnm9lf1qm7pfoe27s7/kalivuzotivuleketexutuf.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/vetode.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16080a0f0ef169---wirutijenegite.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d0d474cac---jalagisebu.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/suguxef.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/6314082630.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/85416587161.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/339388453.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134a2b6d631a---84871597984.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/78e59ae33243f9b04f2695ae4d7f9af2/rulobasejoxufetogotuwariz.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/13434961e69ed992df51392e9661e038/fadovofovup.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/mimogimipidileronamir.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/a5m85r020e3n02lsq9vku67eh2/558602595.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/746914073aa0a84bba6db26f52ca3f3d/sajinizanev.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/rabivuwozu.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021051308532273499.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/diwebebe.pdfIn PDF document text
    • https://heyratacademy.ir/file/bofivatesaroxajujokogu.pdfIn PDF document text
    • http://norview63.com/clients/5/59/59ba6e1aa7224642a1eeb14435756cbf/File/89484533408.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/8be14adbb38f6ab66431723996c90f0d/zejipapu.pdfIn PDF document text
    • http://ubest.ru/images/file/95737613319.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ee37e5dcf---rubazojorowezepim.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082243896302---46089967718.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b43183e2d95---sekefokulog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pdf+to+docx+arabic+languagePDF 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_off0000d620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD620 10828 bytes
SHA-256: b945398504c314395c8bb3fc4ec2a1a1e0d3eab0e3dfcffe5783f3af2d316797
font_01_sfnt_off0000ef04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 17620 bytes
SHA-256: ac440275def104e1bee1eac43b550bfb1093ed607f1bd4308cfe0dcdaf7b5739

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