Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a8aadc33883270…

MALICIOUS

PDF

83.2 KB Created: 2021-09-02 04:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 82a9e9ea9a235092bca5dfa90e9d37c4 SHA-1: 3a9a9eb4f8ae23973a2db31ca6b91bb176705d8a SHA-256: c4a8aadc338832709b8ef7435c9ae28ae2e8124d328e9c89efb57c6bf03864f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://smidgel.ru/uplcv?utm_term=1st+order+homogeneous+differential+equation PDF link annotation
    • http://wasserburg.pl/userfiles/file/90408912920.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/2596424663.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/17404909070.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/wowojikojusufunonapusa.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16111dfc08007d---98447149123.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210528133737.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/vuwowemebuxefoma.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/luzigatadiwixasewazizofek.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/68572290461.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/52896543958.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/vakajefekovemufo.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/2c099b196249f6959b88d68f824ee9d1/rofipowejalazijepekef.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c7534d98112---77841923389.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/xadubejera.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/e71273050e168a01b27c52e1917b8f56/nuwufupenok.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16099e2c77efbb---budiwowunup.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/31546117355.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/24706785890.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/14914464462.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/11522215928.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/ligivolofusudadiligulu.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bea5ef11fa---jafadezonoluju.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/wosamajatobulup.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f857870e3---41935413767.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1627787433.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/pagitefigomawexugoju.pdfIn PDF document text
    • 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_off0000dd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53F 18384 bytes
SHA-256: 60a3610dc35da92cb375d2ae197116b6c3e5d1c30c913709fda9a5ff92d8a086
font_02_sfnt_off00012589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12589 11000 bytes
SHA-256: 3e018243dce50ff8ebc1277c3c384c78a62d297223cf8d7349be60ca45c35ccd

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