Malicious PDF — malware analysis report

Static analysis result for SHA-256 8541af59775b7bc6…

MALICIOUS

PDF

99.0 KB Created: 2021-08-29 08:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 947f5d6885344d500c653d303fb32e5a SHA-1: 68e5a7b7196ab7138ee0081157bc97ef54cc57f6 SHA-256: 8541af59775b7bc669f988ecc34881f38655cf17b1efa987b08e54caa0d840c2
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to lure users to malicious content, potentially exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pixomot.ru/uplcv?utm_term=megaman+x2+ultimate+armor+rom+hack PDF link annotation
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/15883305446.pdfIn PDF document text
    • http://peak-experience-japan.com/xovafozojivas.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/mozimexefilojuz.pdfIn PDF document text
    • http://megalaserasia.com/upload///83453499748.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160832a8acc3a1---89679037995.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/90404137203.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082356e0234a---bavutimav.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/pamesu.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/84042617433.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/nabukakaduxek.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/52324452037.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/8a28e72691f750e4e7dce426309259fa/sokusomomivari.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/366d5f51e6f245371a20eab6069f7bea/4513062954.pdfIn PDF document text
    • http://fotossc.pl/_files/file/64189844885.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/88086859965.pdfIn PDF document text
    • http://surtek.biz/image/files/20150106_142905.pdfIn PDF document text
    • https://blokhol.com/upload/files/99908662920.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/gewezijiraxobojagijoz.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105efcdedbcc---51463510686.pdfIn PDF document text
    • http://sakem.org/userfiles/files/xisefofugozor.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e02d9f0a959---99190376715.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16119a08e993eb---34279645728.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/kosub.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/xazitofuvixuniletisukep.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/56429484868.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_off00010d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12597 10916 bytes
SHA-256: 5776dfe540b7139fe95715c1e8ab96ee4410d497f2db284be0f951737c165e45
font_02_sfnt_off00013eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBA 23064 bytes
SHA-256: 721b80fc774a23750603f3322903efb1855872c16cb57826bde8614938cc5d7a

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