Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44b89c66db94148…

MALICIOUS

PDF

85.7 KB Created: 2021-07-22 00:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 556484af08c9043a7b7282d2818c1690 SHA-1: 154984267f880c2cc4bdd6a378bd6743bd701e10 SHA-256: d44b89c66db94148c9cd60a663c11487823ab72ef0a3a29d147aeb9a2f6a9631
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents.

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 http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58b89914b0---vexexo.pdf In PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/28a83227f38bf8c678c6b01a40d6c0ef/57211225248.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/96981647042.pdfIn PDF document text
    • https://wineart.online/userfiles/file/14124129906.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/fipamisotijurofux.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c02ea04047---44763351075.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecf0496fab---kunewetabedoleronovifex.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608224ba3858f---47371217525.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607de1b2f3449---sevepovoguzibozipopir.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c454d6c44---zebusakiriwiwibibunafaget.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/17562485030.pdfIn PDF document text
    • http://renovator.cz/files/file/33769603331.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/5e167c71e2661feb692bd81056b1361e/70934877079.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/03a378b902dc2a8ae4115c0e13babf16/1112138165.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/14023619009.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/sovapekuzuvotudimene.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3192c17bf5---sizubedekosuz.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/zazot.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/bivin.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/dagobeb.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/lisedaju.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/42609495497.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/tcm9efuc6bk9pe0cb66i662cto/85284936495.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/enii67c1l2vd48k54n4d2u9l0o/zufobokoranabasub.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/53050298793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=why+is+the+fourth+commandment+importantPDF 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_off0000ea22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA22 17436 bytes
SHA-256: fb22ce02bbe69e4cea281d718eeba6bc23c26541a85292a46435134d5efe1073
font_01_sfnt_off00011710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11710 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F27 11044 bytes
SHA-256: 6c5ebd7df67b6dd1425e42d7a0bd8a878bb76f022384ff483f0a3eb44e5c6d88

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