Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f848d43b380495d…

MALICIOUS

PDF

78.6 KB Created: 2021-07-18 03:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b8801d18eff6540fec4520b68ead94d4 SHA-1: 15a3ef99164bb7787306df72f40e293213aa7ec7 SHA-256: 5f848d43b380495d18fb38e4699b6a17a7e75d08a0c93360a7da78c525144292
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/97kt4lmakmaitaprumrhu03850/32611016885.pdf In PDF document text
    • https://go2germany.ru/files/file/94736580268.pdfIn PDF document text
    • http://falerisztika.hu/tmp/rikorebitinu.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/nipivuvosamudawarorofuf.pdfIn PDF document text
    • https://businesslife.com/content/files/zokekobobazofesazonered.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///97988785582.pdfIn PDF document text
    • http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/41651178223.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/kanuxatimonusizuda.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/jiduxakos.pdfIn PDF document text
    • http://bienbao.org/uploads/files/refigafobipafuxa.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/73980126168.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/72721349260.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46cca21356---70263483072.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2c3c44421---mugetug.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/vdb0uch7isjutkf5s8af7bg6p1/wufipe.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/91523057104.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/gekotefadavoxox.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/2nq3qmda8vp2d507h0tglpd2dn/vegelusuvoxerid.pdfIn PDF document text
    • http://markone-tools.com/upload/files/48286953407.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ac840e3b4c0748d4aff5bb20409954e5/11378329568.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073781bac461---bagojategofonatijute.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/gesiva1621384967.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/tadoluvilo.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/mf9aq1cb4e184l9i8hmblc6895/jonagidubobanos.pdfIn PDF document text
    • https://lymfologi.se/anvandarbilder/221/files/945744669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=khem+val+giftsPDF 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_off0000d0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E5 10396 bytes
SHA-256: 63510fa7ede10a8918c74a04a695da2f5cfe2b2d685ff181af7188252ff6eb4b
font_01_sfnt_off0000e866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE866 17260 bytes
SHA-256: 91327bf9a7a727097839a8de2293dd3efe812104e5c69ec8e2e88324e3c57832
font_02_sfnt_off00011599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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