Malicious PDF — malware analysis report

Static analysis result for SHA-256 f844ffdd346b5635…

MALICIOUS

PDF

92.1 KB Created: 2021-07-25 13:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 11718c2aa29534693f84aac01a88d8a4 SHA-1: 884d79b214e502e7bfc4de0fef0cc3a565bed2da SHA-256: f844ffdd346b5635ed085d9b8377d9a976d418f2d85419760cd3735bb40a5ccc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/b54574ac5ddf5c7514b693d53e9776be/88118447351.pdf In PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d03863f39c6---jekubevakaw.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ss9oajmira99nf10m0l4ij8124/66414907830.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/3e87e01cf45939f8ea7297dfc26065a9/kowuzefakigigudik.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/powatibuxuginovufaluzefe.pdfIn PDF document text
    • https://led7.ru/file/14658233007.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/83214189478.pdfIn PDF document text
    • https://irantruck.ir/data/file/43716584824.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/8197ec34d78f41b52b484fd3bb6576b8/95723842123.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/63h4qb9is50ssvpq61ho238r40/50281473352.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/mutepifozoxor.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e3a402c39---98230886099.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210612_0FB2AB1598671C51.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/50850604345.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd3a7dcfd6---85506602573.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/91644611907.pdfIn PDF document text
    • http://cloverdiamond.com/file/sasib.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210724181553_xf1lez.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a163e525d48dba110dd7e880956b4334/zivukexupukaxizadi.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdcdb172c9---sudegukamawijewisagome.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/minilani.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/e58f534c53e7131ee189b080de53ef51/79627975184.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/db34e6f9189ed5e5e2d261f9d14b4420/gaguxinebopepine.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/64685130649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=best+champ+manager+01%2F02+tacticsPDF 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_off000104be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 17040 bytes
SHA-256: 86564a8bb3e465cc503bbaa0d83415f12596de7ac5e5c84a2725106a38c5987f
font_01_sfnt_off000130a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148BF 11036 bytes
SHA-256: bf95be9af1ae45f34af9d7865a9b8811935922bac7ea07abd3378d136304bb8a

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