Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac7a743e0db4952…

MALICIOUS

PDF

78.4 KB Created: 2021-09-09 15:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2ffb48ac49f15a22a18a2e06ad030df0 SHA-1: a29407ddbf44ae1951278eff50be5c8ddc993cb2 SHA-256: fac7a743e0db495230cb8acb0f654a3c566ebdd879b6bdf806c10c23176a8568
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external domains, many of which appear to be part of a link farm hosted on disposable or compromised infrastructure. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pixomot.ru/uplcv?utm_term=speedo+custom+gta PDF link annotation
    • http://pegastelco.com/pictures/files/sabazafazorisimutafaxoxe.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/vogekodikupijafukiru.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/75106106111.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/50103797908.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/r62d5jhqc31v557dnabp3v31ea/59079244756.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/wulozorasewufa.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/91138022669.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/46563568822.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/feditugalumulujosumeduw.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/milat.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/nodikokalopazopelali.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135980711f95---xavinoposi.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/xalarigijovorewujimu.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/wesulapobujumisu.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131414e64d0f---70012527149.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/27266360511.pdfIn PDF document text
    • https://strechybenesov.cz/content/jafijevogewelunosonirowu.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/gokumivapex.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/95550393020.pdfIn PDF document text
    • https://durimawar.com/contents/files/nejilom.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/95526238976.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/saturiniwexexedik.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/laxovivap.pdfIn PDF document text
    • 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_off0000cd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4B 17628 bytes
SHA-256: 9bf6725a155b0bab6fc6e748645097fb41d1465907cca5d9407fdf95bc2028cf
font_01_sfnt_off0000fb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001137a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137A 10692 bytes
SHA-256: 253bc27d35a67bc8e106dffec3fa52d371b12a69820be422a9c87b517d75f1b6