Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c31a2dccc2adbfb…

MALICIOUS

PDF

90.0 KB Created: 2021-09-18 01:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 894d88295780afff6f86e2028875b61b SHA-1: 22a8c2b2ed7efe6a476606268d5d7365dadf3c3d SHA-256: 3c31a2dccc2adbfb4fe7d3e4569d65d9aafeea43159e683b44476bfb8dd0b6e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan variant. The heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms or disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=konosuba+volume+16+pdf PDF link annotation
    • http://cesnek-vysocina.cz/UserFiles/File/80198328269.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210914173116234.pdfIn PDF document text
    • http://servmed.net/userfiles/file/bikoxizepunumujavatudo.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/88647477389.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/718dc14b0bde36cbfe28038c08f6cf2c/69556345830.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/23933512076.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/64625680892.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/totekodesutekokefetavu.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/gixusukewapapepag.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613c32571d085---98445337174.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfe10cc0a9---javepowadolozavakunol.pdfIn PDF document text
    • http://vanhacollection.com/images/files/turukukanakenege.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/87155642616.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210918065928.pdfIn PDF document text
    • http://mcutech.net/files/66754708283.pdfIn PDF document text
    • http://heizler.hu/files/file/zilumuxuvuti.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/v63lc2krjtnb6fr5k5io8rfht4/47503657332.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363ab236a95---21647919807.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/867b077e48550b51b6aaf27c1a77bd5a/xudawejakov.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/8704157270.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021091101111587.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/3d7f5040a2eb765fa68f48b20fe164ad/valifakavulafa.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/saselilifupufubaf.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_off0000eefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 22256 bytes
SHA-256: c925228f786c30b1fb6092ca2b444a15bfaefdb7460ef0a023c3d9f3715d53c4
font_01_sfnt_off00012982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12982 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14199 10888 bytes
SHA-256: a52d19cfdf58735970452ab4bab21468d1be40ae7e1e383d72904b0b1dd1d4bd

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