Malicious PDF — malware analysis report

Static analysis result for SHA-256 85481af5d35ed6ea…

MALICIOUS

PDF

90.7 KB Created: 2021-07-13 16:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce9df8f742601eafefa35402dc4f5614 SHA-1: e984d8828cb81d72e4e0c9c6e70cf38acf402d7d SHA-256: 85481af5d35ed6ea4f55675f94fcf17981aa31e0770a882043cfb63c6096754f
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The presence of numerous external URIs and the nature of the hosting suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://phutungtdc.com/upload/files/34534532435.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/vikvijubsn1c1g7p4ve8qemig2/ragen.pdf
    • https://powermailer.in/userfiles/file/jojevodejamogizixeragozi.pdf
    • https://xn--nmqu14inmf.com/upload/files/veburoxof.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f9e5d2722---52593958509.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607587dfd04d4---pejibenip.pdf
    • https://alshamiltrading.com/alshamilfiles/file/82054417987.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607641a80a3c5---21167772999.pdf
    • http://gramercygrand.ru/files/file/nanijofizoxebezefevawu.pdf
    • https://classykitchen.pl/web/uploads/files/30611493781.pdf
    • http://schokobrunnen.com/idata/dewofenebirirasidanewu.pdf
    • http://wallawallahighschool1968.org/clients/75819/File/vagekajekujujop.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d06634014---65187137032.pdf
    • https://247hvac.ca/fabulous1/uploads/files/sonifofupagitetodul.pdf
    • https://chief-moving.com/editor_upload/file/46754880538.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c554d0bb2ee---dakogixag.pdf
    • https://accuratesearch.com/userfiles/file/33840417579.pdf
    • http://ahchala.com/img/file/7660697897.pdf
    • http://bscartridge.com/pic/sojuvikogotogadi.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/445069f12521b5c8c6f11728fd06ed0f/6561606231.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/26c138qtijn3f141ton86nuee4/4364990003.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/1193bc4860664ca4c43512f2c70f6041/88012637948.pdf
    • http://cancunday.com/travela/img/files/75393262102.pdf
    • https://transmar.biz/ckfinder/userfiles/files/24103186906.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/0i3p5gthpah69ns5i84ekhbfap/lafijujoxasur.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=think+out+of+the+box+book+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_off0000fd41.bin
56460ba6ebc779ab4f6421e6000940d27da8bb9dbf9b703eefaa76668d7493b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD41 17820 bytes
font_01_sfnt_off00012bec.bin
cddb46c831c99e111d9ef2938312f14be211d9a0a8ca8aa4da7f88cae70aecb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEC 10516 bytes
font_02_sfnt_off00014394.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14394 16792 bytes