Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf26b6a975bb172a…

MALICIOUS

PDF

72.9 KB Created: 2021-08-31 08:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4bc3e2111acd9547924cdcc5c74fba9b SHA-1: f5966b4209fbb5357853c3f28954bc6add6260e5 SHA-256: cf26b6a975bb172a2b9aec779a0eacc73e05caf4c42c0689dba274d2d1d7e943
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised websites and disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=nothing+else+matters+synthesia PDF link annotation
    • http://t-eamplus.de/web/editor/files/26880488963.pdfIn PDF document text
    • http://poultech.net/d/files/24914161027.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/bd7705efb782236609de672868c49410/76481117565.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/79011018282.pdfIn PDF document text
    • http://sergeybazarov.ru/file/75280359554.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/76679935671.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/f5b655eb19d9504ae07a11ac075277a4/korevanufosakexot.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/19075538431.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/4de6rlf0ubm8n92csagta7q16f/dabixatodemuwa.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/84767031061.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/tororurama.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/gokozike.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/zaferalutusibini.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/81981085613.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/87051589286.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f171f9c863b---kubejuzofosuz.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4f44e9498---76545793958.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/rixatopisaburuxisija.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/61799016768.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021061909020470554.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085382237f31---gufalufabugudinebomipif.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/61868788484.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_off0000bae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE4 16872 bytes
SHA-256: 2022fedad946317805046322caa7cc9ebcb0ac3476bb6288a0066fc41e44444e
font_01_sfnt_off0000e619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE619 10648 bytes
SHA-256: 8ec3a20108019d58cb5d9e65b0aeabde709c02660d98964cee7676b0bc794c2b
font_02_sfnt_off0000fe52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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