Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff21888537e32c19…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 03:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1ee9e0da28a4eb07574a297a233b5fc4 SHA-1: c24bb668bfcd1ae2a51f789ec80506bc67069a99 SHA-256: ff21888537e32c190488056277dc45aad236e3ea72b20a20d8999dfcecb22165
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads and disposable domains. The primary goal appears to be redirecting users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/diruzifatamixik.pdf In PDF document text
    • https://discovercefalu.it/_data/images/file/guxiwufi.pdfIn PDF document text
    • https://successalpha.team/upload/files/kopudukafemelinugat.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130e638edb06---48939408144.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/vexaxofefusuvetufiridibex.pdfIn PDF document text
    • https://penal-garazh.ru/files/wubofeneneweroroka.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/dixanefenux.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/fec85063ced16aab80b48176b30faa28/nirunemilijulabo.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16133d86db8b6e---sevorulutotogiku.pdfIn PDF document text
    • http://superbarter.sk/media/file/fisitasixakefutikow.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/revogozijonajereza.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/0fdc7f0n7i6udirqtp4je89gj2/41633653265.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/rosojumiduvar.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/gr5e33v7g650l36s8t07mvba86/vexaf.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f44fc7d908---67047218030.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a505977ba---wetujebuvowinagakul.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/bukifesunoxudutut.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/46264424237.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///92265210928.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/78196776763.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/dumilinajade.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/koziva.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/41335297558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=big+head+soccer+unblocked+no+flashPDF 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_off0000d594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 11040 bytes
SHA-256: b73a791c0f6153f715361cc114eb237e176137d727b2c932c9068ee1c0849b26
font_02_sfnt_off00010716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 18492 bytes
SHA-256: 71bd41ac20b6b62492c8eea39f70eb975d9fc21a1a5ec4087594f6da1e5befff

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