Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1dabee370414c4…

MALICIOUS

PDF

82.1 KB Created: 2021-08-19 23:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 72327a1059f649870d9b7495876fa4a8 SHA-1: e6ce67f864e92a3179e380eb9a469ff82900d35e SHA-256: 0f1dabee370414c49f23ac5753966b28eb5687c22774fc4cd3878674c3d40537
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure suggests it's designed to funnel users to external, potentially malicious, resources rather than delivering a direct payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://lifecare4all.com/upload/files/pifetamatupokawewufu.pdf In PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093d6fba31f1---pewubot.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3d9a735ca---vinaporekazobugoximomulu.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/79770761726.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd2cdb6347---dobodutukuvevolejoxovinim.pdfIn PDF document text
    • https://stopserv.ru/files/file/23166275156.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/8dd4a5ceba7162b7bb67a7d445703579/vifofujepusu.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c1a199ae5---51580977474.pdfIn PDF document text
    • http://parishad1925.org/ckfinder/userfiles/files/99488728360.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ea2ce151f---sanipasufip.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/zusifopud.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/xozajinovawam.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/zuduxes.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/zoxadit.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/72599991844.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/0eef4fd0a646e48455fa084fcaee55b1/dapomujas.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/talobixizeruvolepuradogup.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/kedakuluzotuwijewiduze.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e9e03efda---39313792398.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/gvjif0oei8a3qsdo7o908if76s/70977039613.pdfIn PDF document text
    • http://fgosvo.ru/files/files/18641676631.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/fetutomaj.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2439ddf98---43957807230.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/bejigizamowelini.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/27588821405.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be84fa1d77---jokaginikamo.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/46624204025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=solid+liquid+gas+worksheet+for+kindergartenPDF 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_off0000db3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3A 17436 bytes
SHA-256: 6c6430d22fde15fc4939467ea8639088c6a09c6c855eae0f1fc2e825b6f50935
font_01_sfnt_off0001084b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12062 11132 bytes
SHA-256: 5fc4a2d7e095779b6cc6eca3d8145d72c35ad66c7797cf837bf7b01616060ffc