Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a81fc1f786fb0a…

MALICIOUS

PDF

95.4 KB Created: 2021-06-20 10:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a6dc52df9a8c79c062834d7fe9671c9 SHA-1: 3aa447f5ef4095ac776a2fb960e080e175ca759d SHA-256: b0a81fc1f786fb0aac0cf4d5becf11517dc504e0fd70ef1a3428ca7c266b277b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, with the document likely serving as a lure to download further malicious content. No scripts were extracted, but the presence of numerous URLs and the heuristic firings point to a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://coretry.ru/uplcv?utm_term=the+red+scrolls+of+magic+epub
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/cef77bc6ef9a8649c1f4d8bcda65d003/puxixizav.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d46a5580e24d95e587e6554fbaec188e/zazabubiwo.pdf
    • http://fobosgrunt.ru/files/ckfinder/files/bakowepixiwexexevu.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd62c56f71---moribe.pdf
    • http://studioego.cz/userfiles/file/wudozejomotoxigutigajataw.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/aa2d11696b048f979c9cef0f6905e982/lofebapijamib.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a50585d5882e8674861a544cb8dbe8ce/jaxitutudiwipin.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/6e305c1eebd2b3dbc4b8403e52d610db/39715642600.pdf
    • https://fedico.ca/upload/editor/file/40907633716.pdf
    • https://burgas-remonti.com/userfiles/file/2083031961.pdf
    • http://millecolori.it/images/file/60094265834.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a380d56c88c---fuwovolotije.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/789a2f02d62cedfcd640155f7de59abe/66409727050.pdf
    • http://tsradviseurs.nl/mailing/images/photo/file/56208154714.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/ca0e34d1b051b33603fbf91ebff9f922/4895346088.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dcd.bin
c6acebe3750ab55c09714fa1b34f6c70ddae3ce202e1a088ffcbc34adab53285
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCD 6588 bytes
font_01_sfnt_off00011e47.bin
f66a6dd127e6ec159bdcdd5d24bb82ff6d15f0d54e458f374a36ee445649fbe3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E47 5660 bytes
font_02_sfnt_off00013150.bin
db9662a18f444e6775b94e093f0c2a358e7f6f96de5446f8db7da71371bef62d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13150 12220 bytes
font_03_sfnt_off00015a0a.bin
15ab86550d6c43843afdec69f353975b3a3bbfa9ae4c902c2855da21dbaaa466
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A0A 16432 bytes