Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9f4bf697bceaec…

MALICIOUS

PDF

95.3 KB Created: 2021-06-25 18:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69aa2c2ba275a282a15ed27131b7c9d5 SHA-1: 64bb3c11045afd80dc4dde6957094d509fdc64ea SHA-256: bf9f4bf697bceaecfe4d7a62b5cb0e9130cc6f54d0435950850e42a945194dee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://nomylo.ru/uplcv?utm_term=seven+words+of+jesus+on+the+cross+in+tamil+pdf
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/dadosedulasewemekexojuwi.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ada7c022793---75395891175.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/vfa9jdbi30i0buo4h317r5tt1a/metigim.pdf
    • http://accessiblevehicleservices.com/userfiles/file/xinesobutifemaf.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5816d2c0f1---pazufozefogidaninuzinot.pdf
    • https://esperanzadeavila.com/fotos/file/31785465320.pdf
    • http://hani-bee.com/userfiles/files/doranibevazezus.pdf
    • https://taevlingar.se/images/pages/file/madofelodivusanitebuwuw.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a89621dea---ligavet.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/e47f2130352f625a19e3b8d9744665fa/zifebewuwiluvunovemifiniv.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf06e7cbde---nafisabisevalonupomiwanup.pdf
    • http://canxetaidientu.com/images/file/narurawuxiwibezu.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a7fc36711---85397511818.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/4ec7cf4a01d6f8271ab8f80f7586d28b/2534426900.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c92feb92a---foruroxub.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/466408a0053effb26c7c08287d6b21af/9170323509.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/77c651fbf26496574c8c3e7e34e8a4e5/pumutefasekafed.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160cebe174dea9---kikiruzu.pdf
    • http://nacyc.jp/Upload/file/kolosaladiginaberivomupis.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737f2f0c374---73906406481.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b427b876e02---gubezejuserifo.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_off00010ee6.bin
72d6330e41b731e7c89bc532f8ea1a35c10e31bac1a0a6129fe1f6827b0a20ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE6 17100 bytes
font_01_sfnt_off00013bac.bin
d26e917fd4a23e906578e8e66252db03d5b8ab057c98c0d658613197922da24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAC 11344 bytes
font_02_sfnt_off00015637.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15637 16792 bytes