Malicious PDF — malware analysis report

Static analysis result for SHA-256 be038db778a471f5…

MALICIOUS

PDF

91.2 KB Created: 2021-07-06 01:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fa25b032f48a1e593e1052b1695c7d32 SHA-1: a07115a023199e8064ad93b5d0339eaae900c9f6 SHA-256: be038db778a471f5a0701fb0b93b6c5cd450875546468ec792eea7f44f186e9d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/ziledurinusijawezal.pdf In PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/5fed39f9f69ace0463c8ec6538ac53e1/xosekewabokoraserilekup.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/99056962654.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609854bf35be9---tofubukuruvaxavikogeloga.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/46b591fa0cb7bbd132744af040d80950/29506180209.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-14/20210614071409320219.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/80a51615c407f94648cdc5524e16f4e9/xufitilimanafagatoxi.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b90c60166---74488460751.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/97161c106c24a9b9bb448729977e90e8/pabibutomesenowulu.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2181c612c1---xafupowaxesadom.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3365ce80d---12338952007.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb51cd094a---xoviwevafu.pdfIn PDF document text
    • https://aashianarealty.com/file/80030977778.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/kdaa93mics9651360tr2p3ik9b/paferobenuvalisudix.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/gukivu.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16079d855204c2---kibopuxewododumelumukudop.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/xigakegonuxavidifezoteviw.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f470ef59a---pejebonepatifutakon.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/8c44889e9edd7b7ea4d3e073e23f0de1/wezamuvotipokugureralo.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/94709615690.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/63109409935.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c42bd4b72---79698051330.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210608_123624.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/84fd538b44ae4307cbc3f893e4ebd790/jalukowalel.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/h5gq6u05ng7kkkochr2no8p618/wamulanofuzuxugot.pdfIn PDF document text
    • http://didopack.com/files/jawezevuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=khatrimaza+a+to+z+hollywood+movie+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE6 17772 bytes
SHA-256: b7838e8fc97365cdb3f3ee02da7b8cf05663a686d5f781f7a9938142b07fc84c
font_01_sfnt_off00012ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA5 10664 bytes
SHA-256: dde887dd74c43cc0f00d99ec409cf3384573c06e1432feec2d8db2fad5d3a33e
font_02_sfnt_off000146f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1