Malicious PDF — malware analysis report

Static analysis result for SHA-256 f036f63d9b0d1676…

MALICIOUS

PDF

85.1 KB Created: 2021-09-07 19:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 49c83051086a2b44ecd6879d12e9b856 SHA-1: 000d8e701827457675bdfd89d0b31f1d8bc97e42 SHA-256: f036f63d9b0d1676459fb730326d90707d4bec3f4dee906ffbddf48c67e73ce6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document employs a social-engineering lure, instructing the user to install a browser extension or update, a common tactic to facilitate credential theft or malware installation. The presence of numerous links to potentially compromised CMS upload directories and disposable hosting further supports its role as a distribution point for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://delphin-restaurant.com/ckfinder/upload/files/gozinuvulo.pdf In PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/nqtdv226ketbupq6m7ttqg12f4/siretobekuzowafafimizig.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/710ed7df0a35f54f5494c5c02ddcdfc3/sezazamepemonujix.pdfIn PDF document text
    • http://goldmustang.com/files/files/warepedejasulurafupabijot.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607efe57dd678---84506824245.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1610c94bd9807a---dejowoveweporomosusinimup.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/inc0tptdaupssd20m3p9iker3f/xajotuzabil.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/5dapjpg4er24d7bq74c5n9loa6/miwapotowasikoxes.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/bufusanomobu.pdfIn PDF document text
    • http://stylekd.ru/files/1779162891.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/24f9c7e13a3bc8651f600125f60e0290/59001865420.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/besubemapawezujopalurib.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/3af32fbdb0948c4938d63c9d730ea3d1/gimusuxuvolukaxi.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5dd25af9b---58025172290.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/b3jb13gvl825npa0alcoug0f45/sufanizusexi.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd824203d0---61378735276.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083b0d20ef93---4230036695.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/74042194202.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/950210228f309b84fb776046c3f19dd5/8806419915.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/92809f04ef2cffee36501d710e731bbf/25625749710.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf4de2ff8f---80642780780.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/66162587223.pdfIn PDF document text
    • http://www.bash.cl/media/file/pefusadegadebegemal.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/77949130740.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/pamifasexun.pdfIn PDF document text
    • https://hagepoorter.be/files/files/4888782888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=manually+reset+windows+update+components+windows+10PDF 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_off0000e497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA9 18480 bytes
SHA-256: f90468117ddac995b094339c50a2429296e04edcd193cfab719b1aaed99fbe6e
font_02_sfnt_off00012c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C64 11140 bytes
SHA-256: a409a93b70c1e81a271d1267089cbcbb3cf2c83e8b566b69cdc8618539cec080

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