Malicious PDF — malware analysis report

Static analysis result for SHA-256 314c3ad7a861461a…

MALICIOUS

PDF

256.9 KB Created: 2021-08-11 10:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8d1c6337dad27c333c8e263591ad9501 SHA-1: 00ba7150de400fc07d95d3359a1c1ac1ab88c895 SHA-256: 314c3ad7a861461a313dda93948807725143e0f558ca63cf437b4436ec7711d7
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan. It contains a link farm with multiple URLs pointing to compromised WordPress sites and SEO redirectors, suggesting a phishing lure designed to trick users into downloading malicious files or submitting credentials. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9048

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://chcial.ru/uplcv?utm_term=papita+mani+y+toston+2+descargar+utorrent PDF link annotation
    • http://kxqcgs.net/filespath/files/20210810014555.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/pq9nn0l4fn8ftefjskva8lqifi/48570808096.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/poxefuzenufatixew.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f74c9b3e73---resozuxizezafos.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/58170747805.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/93462524160.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/466767ab3d0a53280af368767ebccc71/24170209768.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/lotiw.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/pivanatedoraguxaxaxoxelu.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/0a026c93630f7e4c2f729cc5a8d96bea/84366732040.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/4aqgclcv9uu9v1ik10vipo64ot/nejadopusokedaxofipa.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/df07c4e7d7df9f05d4a3d8e7b0ce27ab/32562430892.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/16620191622c11abfc365f561ce0ab8e/38116106896.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/ginejipajewijorugek.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/23ab54b9ad83a0985cc82ce61b91cc56/63406422671.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/fegipaxevovez.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/1993664953.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/mifuloledawo.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/visurewitexuworol.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ba76d4e12e9ccc37e7458f84c0c346a6/69852315073.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/8236475396.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098c5ab309c3---93005082942.pdfIn PDF document text
    • https://codecs.ro/images/file/vufafovanorakuwekobasuf.pdfIn PDF document text
    • 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_off0003912e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3912E 18360 bytes
SHA-256: 8b98febab405a6a2c59f774e26b46c2bead9df00c72c00f2b63383c9465812a8
font_01_sfnt_off0003c171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3C171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0003d988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3D988 11144 bytes
SHA-256: 7f3ded0f1e754bca0154d6c1cc09b3a156e42721378072ee869457e7f10ae23e