Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91eba0a2a045caf…

MALICIOUS

PDF

78.8 KB Created: 2021-06-30 03:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 156dcb0b838c795c84814e369c180f95 SHA-1: e341e6ccd6ea28275aacf9cc9c7e532a7848a60a SHA-256: d91eba0a2a045cafdab079620d8a7d5c404ef40323f103520b17ab7f18ab4417
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to obscure the true destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e87b2bb795---24505817913.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/e6a5ed29a7799caf6c7c824c2ec8621e/21159951493.pdf
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/220c24fc33d2226bf0bd59a6b4c794b4/saxefaluvirupiviku.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e2a4f19e---96101711715.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/edb925ab97f74d229eb205bf7121eba1/wavawuso.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9bcfbdca9---mebigunejegemazikuba.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd4f7389e8---rawumonajitolejuxanebofet.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609112bd210d8---83959904320.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083347ef1cfd---makuzesogamogatis.pdf
    • http://edgecs.net/documents/gaporifaxokikikisi.pdf
    • http://mea-travel.pl/userfiles/file/30409711558.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba431d2468f---37490935374.pdf
    • http://jjmcp.jp/userfiles/Image/file/32467809727.pdf
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/paralovuba.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988fd8ad2da---97591275950.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fff32b064e---309692888.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/tpd5j5cdf31n6tol008152hju7/91679152514.pdf
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/suwasik.pdf
    • https://cgeminfos.ma/upload/file/81783333051.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/076642e7ec537324c977c4610be8c12b/48486764871.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160859fff09be3---90051475776.pdf
    • http://dientrotiendathc.com/media/ftp/file/jazipitisowoduvixemulof.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=map+of+south+and+central+asia
    • 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_off0000ce88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE88 16792 bytes
font_01_sfnt_off0000e69a.bin
d44ec4d96c526fb8cbf30975f2e2058a33cc9a14b879d1ee1ce669e8942f72bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE69A 17188 bytes
font_02_sfnt_off00011381.bin
347d1b30b95e9547095384fa9077bb06c00051e46b2e4f12627d3ad59a3ef4c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11381 10812 bytes