Malicious PDF — malware analysis report

Static analysis result for SHA-256 263f5809138806c0…

MALICIOUS

PDF

81.0 KB Created: 2021-09-01 16:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 32e28a1d11944cfe52c790cbae9cdc5a SHA-1: d8c733e188ab82432c68870b64837305d6f30a59 SHA-256: 263f5809138806c0d1a4ab9208394e050903cc845ae2f0fcf7e02180fdb4e290
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristics strongly suggest a malicious intent to lure users via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://pixomot.ru/uplcv?utm_term=a+plant+that+has+both+autotrophic+as+well+as+heterotrophic+mode+of+nutrition+is+called PDF link annotation
    • http://chinoboxingclub.com/clients/36032/File/pexet.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/xiwadudowufulivaxuzazi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b2be23fc6---sagidefozunipu.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/74b76b4d8ad149393048a168a214829c/33583694549.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/6b11fecfc301ad02609c505aefc225c2/woposetupubowam.pdfIn PDF document text
    • http://web68s.com/upload/files/69736201330.pdfIn PDF document text
    • https://33mobility.net/uploads/files/susazowadonitezi.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c04eec6c81d---77130701456.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/58816869241.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/5065553435.pdfIn PDF document text
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/33320244552.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/fuvidiwas.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13d3c20fa2---dusexasasis.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/jabofemapijufadifosigo.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/4olsjg5e52pnm3j89np60fu0m5/10083179206.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/poneduxubulidamabig.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/92718791136.pdfIn PDF document text
    • http://markone-tools.com/upload/files/rutonoferexoxazoz.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/7c042f1c2bb8d232484dd80903c30212/mijoxakejizenen.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/3c066fcbb1d9eaecfcc7479ebc8803a2/xemarajivom.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/1905711463.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6bc0f031dc447e158b2eaf017a691cd5/29908537648.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_off0000d5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F0 16992 bytes
SHA-256: 54769828f7afe48851455736ec29c8a3cc98d2763bf5f8ec04c46e3efecb0195
font_01_sfnt_off000101f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F9 11192 bytes
SHA-256: 1b74a1d9d9b2703307a08ba4416a2ff83273b7f2c740517d108f71050439090e
font_02_sfnt_off00011bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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