Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf1b6ac0c29e42f…

MALICIOUS

PDF

88.0 KB Created: 2021-06-30 20:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ab11ba378de8621a2389e0adb691273 SHA-1: 58826fe70470d615cfa3a1540fe2a926bff72468 SHA-256: 5bf1b6ac0c29e42f8aaee1de0bc96f57e9a520a7787f4ee043dc05b426d9ccf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smidgel.ru/uplcv?utm_term=toy+town+hull
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/npkpkilkdkgo4b80sp7pqpq0vq/pijuv.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857b8b4c754---lifid.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dc1124102---14646201153.pdf
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/72805737939.pdf
    • http://fygl.net/uploads/file/070118537773.pdf
    • http://xboxheerlen.nl/userfiles/file/gabisudeno.pdf
    • http://psychoterapia-przemysl.net/img/userfiles/file/xufekegomodudibarorun.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbe425341d---9863455000.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/htnjk6gmfj2f75fli152ohnm2b/sedulelezisafifowipof.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/52ff930b3e938187d69806e1ec31acf4/zugokemitavunum.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f47fabff14---42172872207.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086615041299---27949146817.pdf
    • https://bookatowncar.com/userfiles/file/fosekesegapijanawerixi.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/f9ea36d91720e9e115800c31fcfcb77d/77752478004.pdf
    • http://baigeleather.com/userfiles/file/59090357491.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa117df439---wofaka.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/fenqdg9hsgn990v173rq0rh3ec/raxigobona.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b735357e3ff---34779099665.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/viwawurupinurajasapa.pdf
    • https://aimara-bg.com/userfiles/file/95446317427.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67c4bd19b1---21288231149.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607899f7d6c20---44891868070.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/8edeea7b24fc6ee65b535e09fddcaf9e/8718228202.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160813ea89fadd---85372239318.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728a013f34a---42514154669.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_off0000f530.bin
7ce31e4ccae3e300edcb1efe3ba80afc7019e7c0aa90ad7ff1adea1d7b1969f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF530 9812 bytes
font_01_sfnt_off00010ab3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB3 16792 bytes
font_02_sfnt_off000122c5.bin
15f00f68a2d8e17ad73692b71059fd2644f35c812a4ff29900787dc54d02c747		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122C5 18036 bytes

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