Malicious PDF — malware analysis report

Static analysis result for SHA-256 694b39f12d62c1e6…

MALICIOUS

PDF

85.8 KB Created: 2021-07-06 04:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11e93ed4fbf46a03fb4bea919b0ff3ca SHA-1: cb194cb68bf7e37900934af013a287ac05e0cfa3 SHA-256: 694b39f12d62c1e652f96b71d99e589aba016c144f4c90a10a2583fb38b4f739
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple websites, several of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and does not provide clear instructions, but the presence of numerous external links and the heuristic firings point to a malicious link aggregation pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fb8d33351---78238342296.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/pifupig.pdf
    • http://brenno-tojestto.pl/userfiles/file/negevabiwod.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/7rjf882krnhprv8rngosm9kfe4/53796023803.pdf
    • https://mytopics.it/uploads/file/92394696373.pdf
    • https://unibel.pl/pliki/upload/file/jagexetofizedivuwuxare.pdf
    • http://broeinest.org/ckfinder/userfiles/files/13321103977.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/886a266c2bb597211803efe607f5c19e/xavagirutogadirexif.pdf
    • https://bursakaynak.com/userfiles/file/29497457778.pdf
    • http://kapelski.pl/userfiles/file/27296823695.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/iufrkobppepvs5bs9meu4dm5od/22517543908.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9e42f105e---77646491077.pdf
    • https://dotcomtravelegypt.com/userfiles/files/28156605566.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca4627947d---57044624143.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e240082740---mugeraperabave.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/pewojekeli.pdf
    • https://accuratesearch.com/userfiles/file/8826230808.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075544d32e42---87527429152.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854e5fd5f04---wakireximemo.pdf
    • https://aashianarealty.com/file/54418135062.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b971b53d84---44150750250.pdf
    • https://proektasis.gr/admin/spaw2/uploads/files/lupipezijopozibuzuf.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd223a962a---14997216411.pdf
    • https://pathakpharma.in/singhania/downloads/file/siwejugabesapaxoja.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=gluten+free+chewy+gingerbread+cookies
    • 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_off0000e9d8.bin
37052ae3374ab86daf9d8313c9d0d756b90e89055d4e25f0d3d67aee049e826c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 11328 bytes
font_01_sfnt_off00010452.bin
a68e4476ae4db3cc58525e7cfac8ded0a773332dd83d57c93a16d3a15ef6502d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 17380 bytes
font_02_sfnt_off000131e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131E5 16792 bytes