Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4cc4c0b92f6090…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 04:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d8e2358e46a9acad7ad922c7685b4fa9 SHA-1: c832c69f8dbbeaa350a905b9396206fc2b96e135 SHA-256: 9b4cc4c0b92f60908e743fa1d659e163c731305202720ebcb8f357012f2f4d3a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are compromised WordPress sites. The embedded URLs and the nature of the link farm suggest an attempt to direct users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://stollerco.com/testingsites/advantage_aviation/assets/media/file/zabomajakuvatijidirenekef.pdf In PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1560571ef346143b0d0b4c2c40c6b25d/16366540597.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/2i091h1elk0kntds2od0q8sjs9/gupuzezexivifolawitema.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/pdv3mscgpa1rl3180b70923j82/98078869826.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/4547358890.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/20e7a434fc83cfdb726f3b8d69009f5c/47745876344.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/fe26b299b7e89b77bae1687212253750/2866292809.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775a281f891---rexezeruru.pdfIn PDF document text
    • http://mastersequipments.com/ckfinder/userfiles/files/pusorarafunuvozomexoni.pdfIn PDF document text
    • https://anaksemut.com/contents/files/lutelesovojizewij.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/suvijur.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/wazitupomijegususumiwag.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609344b628986---zolade.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/b9678494c12bdde06cc4bde22eb6138f/xorifilezatatulux.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d26fc996d4---91211533799.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/49838848499.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607499fe34e46---70469631841.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f9c6f99c339ef291ef07a0d26d2fc866/1112928990.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/26026851906.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/6562085882.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608559acc955d---28723424509.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/7f5d7ccdcbab587bc85c3838235a244f/jubenebodurifojaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=list+of+aromatic+plants+and+their+uses+pdfPDF 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_off0000ddff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFF 17564 bytes
SHA-256: 361335733dfba48b01bdcc6a07f1527b71e4d234e6611e6b26162a3afb12abc8
font_01_sfnt_off00010b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B45 10940 bytes
SHA-256: b9fece5bc32817f72db96bb90894f30bf70c0a3e201c56920035be17e37144cd
font_02_sfnt_off00012474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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