Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a3c15e8570468f…

MALICIOUS

PDF

86.4 KB Created: 2021-09-12 01:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 472969c74f45ddd4cf1212b3fa226ba6 SHA-1: dbebff4bc8e60593afd3a379d0dca5b233d90109 SHA-256: 22a3c15e8570468fb2a7330d70b379d9698e043b26f1d733a0daa7fd2dfa06e9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable or potentially compromised hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. The file's structure and heuristic firings align with techniques used to deliver malicious content through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kxqcgs.net/filespath/files/20210905060018.pdf In PDF document text
    • http://life-homeshop.com/asset/uploads/files/xamal.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/97839109690.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/banisijemin.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/pexikovoxi.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/suvemovutisos.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137778625d25---mozonifejabuxaxozov.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/kofexoregovipegiwogiguzo.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a30502bc95---wewuneti.pdfIn PDF document text
    • https://j26clean.com/upload/files/ronizefowumesom.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-3/20210903025732747064.pdfIn PDF document text
    • http://www.pilartangguh.com/file/ripijotol.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/sokejugagiporajodofigigo.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/xupovanopugokixesuwom.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/japufopesamaguvitufobes.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/12578012627.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/jisolovepotupadu.pdfIn PDF document text
    • https://digireg.at/upload/nowozilunolinuta.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/40510333900.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/20960235869.pdfIn PDF document text
    • https://pellevah.com/upload/files/gafexawumubusevidelofaze.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/wusupe.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/t1ormqlcg1ifqr76r4h948svs5/45130802288.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/380730369.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/vedalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=android+app+time+trackerPDF 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_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 10532 bytes
SHA-256: 1a2bba14fd2f3a845b327beb7be1db2e6af56cde40080f95e556216826296984
font_02_sfnt_off00011fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA7 17168 bytes
SHA-256: e0cffb857e976fd2c872f32fdecdb6b334031f342c39becfcb9c340b9718596c

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