Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf5a90caf8b709b…

MALICIOUS

PDF

90.2 KB Created: 2021-07-06 00:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 82fa2f50df291a0b4c48610dedd1a40e SHA-1: 5b00e993b5b458b7182c9b384d1204731cc24667 SHA-256: 7bf5a90caf8b709b5f75ccbb9c473040ea3f3bbff9d2277ea6766d0aa3e55585
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other hosting, suggesting an attempt to lure users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ai981ipbamhmjbeckk6ge28mnm/furivipajalo.pdf In PDF document text
    • http://aire-limpio.com/img/editor/file/35495807096.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ca0d5ba3ff4f73e7954fa547e84bc01d/vibulorufajujaboxokizu.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868ee90a05d---lepegerulesajagewurewuxo.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/1412a0d4c253397a0426ef7e336530df/79495928601.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/18073020122.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe88f899a3---92971060430.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df9bbd455a8---rusiluj.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/20191666543.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/53803039353.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/2638273079.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e3bc4d26a---bubifatirajikisifad.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d37c5a3993f---dafuzimovokagagube.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/opfnv62lgigl9b52mc6bdd5gr3/31616072663.pdfIn PDF document text
    • http://i-dron.cz/data/file/movurixuj.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/14b82a4e8b8a616457a9a63fdcaf7ad4/69272104352.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/sajaz.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/46848873743.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/wigojorovamefexa.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/h8tr6pkefj69vvtnu4vkbbk8q3/lokogepulameliku.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/69140772804.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/40d316eede689e207921b1b9f7fa3e45/86031987461.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1e1483cf9---xusirijadotasironebutin.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/151cff4c2b5bff55a0416f90a88210bf/69119969342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=personal+grooming+and+etiquettePDF 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_off0000ff86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF86 10836 bytes
SHA-256: 4a33ea39633d13eef0bda6d0c50357e727fa1f2e7c85fc2d79482b2e4cb169db
font_01_sfnt_off00011806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13018 16788 bytes
SHA-256: e15bab38a7d3eb76b8ec806e29010518599cbb3bfc7781d3069a4331878ee104

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