Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea97141c6b1d6b0…

MALICIOUS

PDF

117.5 KB Created: 2021-07-13 21:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cf8d8b16e39fa1f20cf4624354af48c SHA-1: 9ac6511a427051f442076e0987fc3e2bfc8063a4 SHA-256: 6ea97141c6b1d6b02f51cd576dcaf5198be01cde84fc1822cebcb3f80a810a53
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV also detecting it as a phishing trojan. The presence of a 'content-enable lure' heuristic indicates the document likely prompts the user to enable content, a common tactic for malware delivery. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest an attempt to host or distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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 http://studiogaleazzo.eu/userfiles/files/91294743576.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083031c81789---11769152910.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/db6a0b70b364fbea768a2e5d2680c99c/potitamiradiwifojeki.pdf
    • https://manualismedicina.hu/fileok/file/gusisazaxilexak.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e9ba2f9ab---saluwanutuzetixodiwozu.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/54c2980bbd7e82ec77db0889704b8d2f/45854646892.pdf
    • http://zaun-produzent.de/userfiles/file/19632641401.pdf
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/guvetowiredegawusuv.pdf
    • http://tribo.kz/userfiles/File/26891973317.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbc2d34ceb---26360717464.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8071917a0---xutarebav.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f31a253d85c7fbc5d0c26befd690a99c/wujorovixewonagiwa.pdf
    • http://hoangduy.vn/vn/files/jepubeto.pdf
    • http://inlygiaylynhua.com/upload/files/19119144642.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2205e60bba---27322643621.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afac7c66e77---piworexosirad.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791609c1f31---zaletuzogibovemiw.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/balazufivafuxikokuke.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/cbb691fc7c1ecef4e858f8b0fd64b6fc/bokatovol.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/3ce7k0vvmjugfa0nak8jai0fr0/22139057597.pdf
    • http://yjsyrj.com/userfiles/file/jasuwufabuluwi.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8daa83b13---birad.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/md6iql55975dabvu414qr0hj32/gixetozoxivaxiku.pdf
    • http://www.asslar.de/downloads/tumuxa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=post+diphtheritic+paralysis+meaning
    • 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_off00016489.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16489 16792 bytes
font_01_sfnt_off00017c9b.bin
c8d8b6045eb4b0bc5ed2334d3c1df4c29e5dc49cc5ecf814f0ad69515493870a
pdf-font-stream PDF embedded font (sfnt) at offset 0x17C9B 18728 bytes
font_02_sfnt_off0001ad98.bin
ed9409458999d2c51ef9e9655083966f795eb0f33e4e2250440f2debe4da9c0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD98 11076 bytes