Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6cbd4f00e3398ed…

MALICIOUS

PDF

85.9 KB Created: 2021-06-25 20:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8550cfd7919d6936ca03f9454cad682 SHA-1: f3d7557c877198c6d66c5172526d083701810e08 SHA-256: f6cbd4f00e3398edee9d87ef1c75ab763656e45a6b5bf248eab10718ca7221c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm hosted on compromised WordPress sites. The embedded URLs suggest an attempt to redirect users to potentially malicious or phishing content, aligning with a spearphishing attachment attack pattern. No scripts were extracted, limiting the analysis of specific execution behaviors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e988be8b54---47023562300.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcec056a2b1---ruxir.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f194e8f0f1---nasotagakisogodupiroji.pdf
    • http://yaqeen-eg.com/userfiles/file/20174638666.pdf
    • http://cherryontop.pl/upload/fotki/file/muvim.pdf
    • https://drsubhashawale.com/ckfinder/userfiles/files/gorefuwamika.pdf
    • https://an-professional.ru/img/files/file/24422847927.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae04f3d576b---goboxujujizab.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b3444947d---35297407740.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/lapemusebave.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a39724f12---4005679099.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0f9fb08ab---mitajuxutorezigube.pdf
    • http://fritz-fahrlaender.ch/download/sumumo.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/wifuvoforulawiremovuj.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca5754141ff---zafulujijume.pdf
    • http://yasairamenbar.com/uploads/files/rotodamopitimu.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba745d3025b---wagisofuvefagunufuv.pdf
    • https://abe-rdc.com/userfiles/file/32027114000.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/47070895692.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718ae146e72---vukilidifu.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/thi7809uquqgj10j6qu6tnv9q5/sirub.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a591a64e9d2---lopizaxeluwijujikovaxaj.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa37b0a0b39---1833195572.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/g06s8jmdbuikkd805n17v2sh1p/kejaxejozuxidezije.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/9ood2lclf7gukhhfgi83qqb97i/3496419482.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/76905237250.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=for+sale+cottesloe
    • 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_off0000ef50.bin
9c9924bd98850dfa789021f8086c2e89e6bf2f38c042ab3cc9941f3c0a158848
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 17164 bytes
font_01_sfnt_off00011c0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0A 16792 bytes
font_02_sfnt_off00013421.bin
1c3ebf7e847d063be127b9fdec02693a0d0f20efdff102af92f16dd6ae5ab4e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x13421 10004 bytes