Malicious PDF — malware analysis report

Static analysis result for SHA-256 498f427ed63031e3…

MALICIOUS

PDF

89.2 KB Created: 2021-09-02 02:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5a47603fa74112e17d02fb4b811435d6 SHA-1: 631d4fc76368aaf48c7aeb77292ca54183f0b02c SHA-256: 498f427ed63031e336fe113ae674c6b2625a799db622f823966c2e40533e21d8
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 external URLs, some hosted on compromised CMS uploads or disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL destinations suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://unesco-mediain.cz/fckfiles/file/mupizawubonoruma.pdf In PDF document text
    • http://afghansolar.com/userfiles/file/towixas.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16078f6e05cfec---70808333958.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/rogawif.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/72471202857.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/wazevizanibapesetujesif.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/05e46a560072dbd2e1c46351b2308414/50168095550.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f73cdb221a---23127199841.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/pinebij.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/76672357345.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/bbaa7aec4287194ec03563fe96b92fd3/83039989510.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/gp24cn9s1g6k4li0rjrmh1c424/58207818085.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/kuxuzekuzorunufazu.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/69397874832.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/mst4hh4o99me0lulscfnlcs5gq/51083852200.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776ecd766f2---selubifuwixoviwuz.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/supokerigikilulujavakum.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/96669901280.pdfIn PDF document text
    • http://fxmeat.com/upload/file/a9484a95765a59c521a6930e90175637.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/ad1f7f22e88572b1d1db225a864d0f5d/makumuwosojowuluga.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f109539111---modapisuvoj.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/50024984020.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/kopufomedamitob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+add+field+to+pivot+tablePDF 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_off0000fb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001131c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131C 10400 bytes
SHA-256: f2d36968bb0398eaf2c1ebee3c18b58eedc4fb31e36574e127098fc1eaf17e18
font_02_sfnt_off00012a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8B 16912 bytes
SHA-256: 0a8df6edaae7571bdf629f5c3a36550b58aa340b1ab901ee4c068ea9b1fa055f

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