Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e03e590d616aefb…

MALICIOUS

PDF

91.9 KB Created: 2021-06-25 12:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58af45a207c96364268d0a657faa4db4 SHA-1: d5f2d44a272e5b2baaa8be44bacc04b8c3303d8f SHA-256: 3e03e590d616aefb30ae055fce3b8efac2215557c8176d41b1922fd17e687ce8
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=how+to+fix+trident+in+minecraft
    • http://teplolux72.ru/upload/file/77244026695.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836958edd48---bitopozawisamekodisiwet.pdf
    • http://osc-pribor.ru/products_pictures/file/12305597923.pdf
    • http://zkojicin.cz/userfiles/file/nupikewezobonotuleloweg.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783357e0576---defetozogavol.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/qm0p9538gs75uko1kvgajckg9t/40591000120.pdf
    • http://www.aqsclimited.com/EditorImages/file/pipageronapotomevog.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bbd172653---zawerakexawapezu.pdf
    • http://fly.no1-yes.com/userfiles/file/48779806887.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fc188873e---12582812944.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/i57ifdufgason9f5q3ulrj3ju4/kiminozafixasopavek.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/87191f2861a36aa09ef673ce06f9549c/ratigekilitaxo.pdf
    • https://digireg.com/upload/4960455694.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609467a345df4---dazosofofotabip.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b7585ba577e---2632787192.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a447ab370ae---xasupix.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_off00010180.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10180 16792 bytes
font_01_sfnt_off00011992.bin
1f14c2d96d661dd41efac4879f06c76d39e52fa168a716c28ffb4a225c011b8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11992 17928 bytes
font_02_sfnt_off00014903.bin
9a40782699e8c217fdf87351811678e6090aae451355b0912f3b8a34a578d4b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x14903 10604 bytes