Malicious PDF — malware analysis report

Static analysis result for SHA-256 318a2b55295f92bc…

MALICIOUS

PDF

87.3 KB Created: 2021-06-28 20:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ad38ca6298ed62777cb669b774d021f SHA-1: 46db2b7a613479cd26d15141292fb051692534d3 SHA-256: 318a2b55295f92bca9de327c7984da006259786710cc58d845d46c4215b7606b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver further malware or phishing content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://asirius.su/wp-content/plugins/super-forms/uploads/php/files/152bf1c89e04c72af054e13f60643934/jakiwakazirogezufizisarix.pdf In PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951b9118f01---putebafavaxirokomawoxuba.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b3e6ae733---fupigaguwupotodeb.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/itjmr03p8l412gkm0ubfk6nmih/67864745497.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/090c0c91981ab651d1eb8adc93debb43/ketiw.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/45624328911.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/xavenub.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/k1hdhn3alr6gp12t9r676vo1s6/pinanamosoxezevej.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/3icirurhv6kb7vusi8fkdbei6s/gagosufalusinebobijetiwod.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb9cfac57f---46750831888.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/bilokaremi.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/sudowabe.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/dfcf60a5676ff66cbf4a5d701af58267/piwikus.pdfIn PDF document text
    • http://ithaca1960.com/clients/8/87/874e400c25abfb160fd1c0cf9913fcd0/File/9473195011.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5e64cbf35---zisazu.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c363ea78315---57685522665.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/vidovoni.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/zijejeb.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/bupabufezeviwivu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/36ac1da4feae32bf11f13e4dd16eac99/torinopujaredus.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/jtgjmfohdnskts5eifnp3kq4c4/84767261956.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ca08960ac---37363274133.pdfPDF link annotation
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/32fe2e850ef703b78c6c7b8cc3ef8fb4/38268341445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=who+wrote+the+devil%27s+biblePDF 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_off0000f1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B5 18656 bytes
SHA-256: 7ef1e64d3c5db23979fd7886fdd6fca952d1791abf0da433445262f03c2f99bb
font_01_sfnt_off00012098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AF 10400 bytes
SHA-256: 4734433213487c7a30d70f69d97b2a8a74fc1b4f43c9ae2d88f9038f3b446ba0

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