Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9624d18c0e2ad8…

MALICIOUS

PDF

80.3 KB Created: 2021-08-14 10:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a25a9019254723598793033b8a986318 SHA-1: a094079223de31919ade400451b893bf15147daa SHA-256: 7a9624d18c0e2ad8ad90c1e06d1c00c187faad72eadc40dd6492b6c151822ee3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other potentially malicious sites. The presence of external URIs and link farm characteristics strongly suggests an intent to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://queure.ru/uplcv?utm_term=kumon+level+j+math+answer+book PDF link annotation
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608553e02252e---kujeju.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/retiwatagafupuvebajumedi.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/2904366195.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/loloxemisadaderovatan.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/66764690444.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/q3mqspgfqr8sarop0j7jmpgvul/zifafonid.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/zomobuxezubalo.pdfIn PDF document text
    • http://inncredel.com/uploads/46343260129.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb62ca2eb2---pavapugofetusexaxi.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/tewuguxomi.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/35587000509.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f5b1a1785---kekowefirarip.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/47713705277.pdfIn PDF document text
    • http://usagimatur.com/files/others/fosapum.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/30626749195.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/398d549db23d6428590b049c727b5907/nulotivabeminadipedita.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/fiwifozeselotexe.pdfIn PDF document text
    • https://begili.com/uploads/image/files/9387900702.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_off0000d73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73B 10884 bytes
SHA-256: a3a2cff102b9d666fabd3daa4fd20203c475ab4e54ec8885f9895772148c4f1d
font_01_sfnt_off0000f04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 16312 bytes
SHA-256: 4085ceef7fc320bbe2a6e9eb90b55a62e8f113f4dda8ad6a87b79e1aa4e44c8f
font_02_sfnt_off00011aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1