Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d6a29c946f12a6…

MALICIOUS

PDF

112.3 KB Created: 2021-08-10 10:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 216607c07e10e513cdfd35e32e7a659b SHA-1: 68f53b80af4f6376febb6406b0e0ee671d0680b6 SHA-256: 27d6a29c946f12a6d97f0ebdf2a8be7e52da4cb2b45311db67c74d842d89e2a3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL targets are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://tractortools.cz/ckfinder/userfiles/files/bedulubivitoku.pdf In PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fa3bf3827---81040134571.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/bazexexidimaxomajik.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/gejexub.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee13414b3e3---xajalitajojasijapalipepe.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160869f68be5bd---33249613083.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/edaa20784a5b3953bf0b2436b2b88ff6/79554426649.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/fobibofivudex.pdfIn PDF document text
    • https://hgb.se/filer/file/30734532797.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083f0290146e---tovek.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc58ba9c44---49633864847.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/90246024758.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/6uhla7u8p0g4evs6srstj46q73/73680484414.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094699fbd6d2---77666117290.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/d9d1fde6bfa4a7c7a74ec46b159c1b17/dumiwezixokewometamagos.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/261bc9472aea38a4f93e462389280f3f/fomizujitowazasodame.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/69164816749.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d965522bf---2344114916.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d96b351feeb---tagiwuvirejaf.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/1704185504.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ce8caf0fd4487a27770fd822e106fb8a/47575581399.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/8h1rrl8523ha82c68jaoam4odb/lurotavezifusawawa.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/laxorev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=dominic+o%27brien+best+booksPDF link annotation
    • 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_off000152ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B01 10448 bytes
SHA-256: 8d371107f13b82b8ec251fda9050ac604cfbb7079fa785b43aaa7b70572be728
font_02_sfnt_off000182bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182BC 17956 bytes
SHA-256: 2ed55a841fffd957133ffa4c2e6a33562747832e4c5ddb2c413ece44698c13cb

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