Malicious PDF — malware analysis report

Static analysis result for SHA-256 0467e1c2d888e603…

MALICIOUS

PDF

77.9 KB Created: 2021-07-02 09:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5da8e3264b352f2a9ce8714ef132674b SHA-1: 5c3ba48b4319907077275bf8b6f3af56423ebb2d SHA-256: 0467e1c2d888e60317c9df30f87d19b002ca5e0ed00c51798e8f0ca8ae231d30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the link farm heuristics and the high confidence malware detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://abwmountvernon.com/uploads/files/temixafedovififewuda.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9eadfb667fdafe68937130f9d09ae9d7/19268514942.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609869bb7d249---26715186518.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd3f59df25---gikisopebiforejoma.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab9597f7bf---65335029442.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/63325022902.pdf
    • https://aspaeng.com/files/image/files/27239527922.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/13b1b6d3165347a0a3d0f2071df36db1/pinalategezajusamujef.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb34f1eaf0---wozako.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8ea6bdd67---rinumuxovexawevu.pdf
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/xorubaripazurawapobon.pdf
    • http://gd-weimi.com/upfolder/e/files/20210611122047.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3jvqjf9g0t63snchqe0sopu41u/71132665218.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e574481e6453c56158e6042977dbcb5b/jupuf.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9c5cd944e---vivab.pdf
    • http://allprintusa.com/admin/images/file/74695970070.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901ed66936a---ruxijegerivo.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940d4bcace1---754181630.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e81e3b499---daxujesutisaguno.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/4ad2280f3a4edf7dbba5caa06365ca0e/gabawutofogaron.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/6c573730a014a4adf26857ae24f9ed55/31453973432.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ao2o0sht21m1l1aahism7ct9mo/wepojipuravetu.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d41c180e95a---xodisa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=starcraft+2+opening+cinematic
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd69.bin
34485232d9a221682fd0f00f9e7620373f93e14741260fd15254223b4fd5085a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD69 16852 bytes
font_01_sfnt_off0000f974.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 16792 bytes
font_02_sfnt_off0001118b.bin
b7a30f46ab312680c238a1f7cb462ac3642be2fa7c5c56cad5826c03d831ae83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1118B 10804 bytes

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