Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d97dda10bcca05…

MALICIOUS

PDF

83.1 KB Created: 2021-07-10 14:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 849c7b6e52862f6c0bc40b2d1965814a SHA-1: 3434ba597d582bffea75f435ded73dbf0aa1719e SHA-256: 11d97dda10bcca05d5a7f2322b5f6fb579c6c1b3233ebf11755ee2bff44c0bc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress sites and disposable domains, a common tactic for distributing phishing lures or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URLs suggest the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=describe+the+goals+of+psychology
    • http://crystal-lamp.ru/uploads/files/62834552065.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adaad32513---wagipisijonopulelirewafa.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/b4ea26b6b58e858b402a22fba0dbc1d3/lizixufar.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608307d2eb687---71338178162.pdf
    • http://grandparkoptimum.com/ckfinder/userfiles/files/95737194101.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/scorkutclicu018hk8pd4m2mh6/43415161271.pdf
    • https://turismoporsantander.com/aym_image/files/xifaral.pdf
    • http://booklandbooks.com/userfiles/file/93180834444.pdf
    • https://kabelkyaobuv.sk/editor_uploads/files/14505927199.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/49b65caab9ac61003b3bf95625523bd0/noziga.pdf
    • http://nage-z.com/ckfinder/userfiles/files/jilenexene.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072034a69648---39286042810.pdf
    • http://cascinamana.it/userfiles/file/biribovijobudukuzagav.pdf
    • http://www.findvoters.com/userfiles/file/pelilajorasakep.pdf
    • https://uppersanduskyrotary.com/cms/files/File/15875725981.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3da2ea2b28---13209079109.pdf
    • https://techielingo.com/fck_uploads/files/29590654835.pdf
    • https://webmenuplus.com/images/file/40364364078.pdf
    • http://gawwaclsc.com/app/webroot/upload/files/dozitetejojoku.pdf
    • http://rgn2u.com/userfiles/files/vanaxuwi.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/30lm81un5lk71kcul3kb9phk7u/xixafematur.pdf
    • https://charterfori.ir/basefile/charterforiir/files/xatutu.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/7aa162c41d7594fe9d4a78a72d9f1d07/66337746224.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e30d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE30D 16792 bytes
font_01_sfnt_off0000fb24.bin
1983a9b06659378aaaa53f24ae1014207e2a48957e126c4dcadfdc7f64c11a2d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB24 10912 bytes
font_02_sfnt_off0001145c.bin
8646d569b8c3b18eba25ac5828f9a757c737c4b07a7f4e74caca5ab396722b9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1145C 16596 bytes