Malicious PDF — malware analysis report

Static analysis result for SHA-256 c651f6a578c1d9ab…

MALICIOUS

PDF

94.1 KB Created: 2021-07-05 23:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e7a28a95df0382db850be13295aa379 SHA-1: 3a284de79b4a94a5ee6beda39eb9440eb2a0f15d SHA-256: c651f6a578c1d9abb3058d93fda6bb3c198701a039c1f94232373e5dac5168ec
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/m765biu5gr7omfh8v4qt7ip8vl/7122290770.pdf
    • http://sotel-perm.ru/site/file/pibazuxezu.pdf
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77265055244.pdf
    • http://dianacb.cz/userfiles/file/60006428637.pdf
    • https://securityguardsupply.org/php/uploads/file/32107233735.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/9c5e36fbfbdd5f66db11e43beba18adb/81006858633.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d523035856600a42cc505f3cc49441f1/68758932326.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c8180293---71342105806.pdf
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/87009375294.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086734e2daf9---51184754950.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4671c6d588cc02913ca70d7b9aa0d3ef/49862103516.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/33feb5e86c65429cf52714bd2b719c39/78188037562.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1197a93f4---doxakelewukuwinon.pdf
    • http://creptiles.dk/userfiles/file/siputumo.pdf
    • http://kipia-nn.ru/userfiles/file/18596071674.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c7d057abc---ladexojotor.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085561342d1c---soguze.pdf
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/60637031666.pdf
    • http://fitviewer.de/files/file/19608294497.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e1ee4b9c6---fubetix.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf7b80597---17731304186.pdf
    • http://caf-ljubljana.si/docs/72403925203.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ecologists+study+relationships+study+guide
    • https://lapdonline.org/file/fogumojufanitodexun.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf4b709f5---67709322848.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_off00010c10.bin
81723756971f0d6df4d598aabb26ace6a1fb765c88b90550fddf201aa3618e1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C10 10988 bytes
font_01_sfnt_off0001255b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1255B 16792 bytes
font_02_sfnt_off00013d6d.bin
d3dbf1ac23aa3b6304b2b2310a35917d0b8af2668f5b65b42a18513e02702b8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6D 17708 bytes