Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0c440a589eb559…

MALICIOUS

PDF

86.5 KB Created: 2021-09-01 10:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0e08d07547a7aa03caa2e5e4b29fe682 SHA-1: 9e0051bf371e5ab7bef018a8d59121ff64af8447 SHA-256: 9b0c440a589eb559e06147bf7fb60fa35966a12ae740aac926d7319a37608f1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://laborke.ru/uplcv?utm_term=biggest+stock+losers+of+all+time PDF link annotation
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2f9d01408---fijuj.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/zepisotexozizivotetizam.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/86483864635.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/foripumag.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/gagiraluluruvuzig.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/gowimujoveridaxuromuro.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/tatusubagimujedegevati.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec7e99fc14ee4da92bf0308f5f5f70ec/15485248363.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/18116731533.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a86e423c47f---jijifujixovep.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/jopib.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-8-20/20210820214749254308.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/tetaw.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/45371972156.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe69cdc534b---56452283893.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/5af96aca154c764cbdd010cc249b7f33/21899571182.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c175f1edf0---vadaz.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/7ccff907c895e711fe31f00ff47faa75/1328201576.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdcb0041b7---zidamerulimi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/i210p9l8pjrr2jgkj9f6vm09k2/52005707662.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/a64b01f318419b0ac1ff8b1af854ae95/virul.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/53027301285.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/40999372937.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/komipugu.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_off0000ec36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001044d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044D 10720 bytes
SHA-256: 8a1d092405c553b11b3d30ad157bbe9d79092113138bf801abea778ad734e0e7
font_02_sfnt_off00011d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D00 18076 bytes
SHA-256: 634d0de2c6f674b14f171ba76ccc295f688a5aef9e6c5c2b0ce2922cd6907f0b

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