Malicious PDF — malware analysis report

Static analysis result for SHA-256 5818ee1f6689d9e4…

MALICIOUS

PDF

77.5 KB Created: 2021-06-24 04:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d022faaf013842cf34a6de8d45784592 SHA-1: 0541926d4b8df1c44d088e42093cd5743e0c3117 SHA-256: 5818ee1f6689d9e450a826fa89d0831273212b0b9ddca4d09c035544e68eb503
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f98ac28470---11569096829.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/8furrafc74cmh1ok99dbdvefo6/gedupofaluko.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16093d32a2b61f---37350231084.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/3c676c65fd8a27f945c9a204ac90e45e/25911374573.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/f198ab0a5b279dd9a447957ccce25461/koperowodamuniwozigitipik.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/32eba13fc4fc44b4cf0196948d7968a0/valirekiluvamugoxufime.pdf
    • http://ever-pioneer.com/upload/files/36055440388.pdf
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/nlr0mk4uu7fu012pqosfh27ob6/nowivobisazononedazomup.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c51924df6b2---legupojukone.pdf
    • http://rogersdesignhouse.com/uploads/files/kazakegolulilavik.pdf
    • http://bike-aholic.com/UserFiles/file/kasixetam.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c179a3aa22c---zuxivuwox.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ff10689b2---88332567737.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/775f9817e5d27f0626cdad675da3e83c/40447178840.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=la+quinta+disciplina+libro+completo+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e67f.bin
3264fe2531c9e4a01591455a5abebefd6bb35c4929fb21424ce3adaad71093e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE67F 5600 bytes
font_01_sfnt_off0000f985.bin
9614992e5ab4e37ebe349c201f736f65933d941896d03035344384680a0b1579		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF985 15120 bytes

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