Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a494c252cfed87…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 10:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 32136f32cff08214ba2659b511faca84 SHA-1: 6cabb08dafd630bb43ac2fc75f9ee035655afadc SHA-256: 12a494c252cfed8767eaa5363ce5d24b19d8a0a14a078abcc43534f16958d92d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://coretry.ru/uplcv?utm_term=tom+and+jerry+is+there+a+doctor+in+the+mouse PDF link annotation
    • http://ingegnasrl.com/userfiles/files/fuzivukeligalip.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/58660706114.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/nakekutobililaxa.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379a4f6eec4---roxumuxinivatibotel.pdfIn PDF document text
    • http://meta-min.com/files/mojevebefuxenawu.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/92299009943.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/76551384373.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109022120542991.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210901004822947889nbaow2.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/49598178313.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/pedufu.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/49853425197.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/zizatutumemivadipebural.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161337898ca69a---14023170963.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356ea5f3328---63879753487.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/runagezodilif.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/9282062242.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141392e4f988---6404347383.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/dotaronananozire.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/zofalen.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/53910510499.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/59045038691.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/pirezowar.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/susezedaseto.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/87296816344.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_off0000d80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 18196 bytes
SHA-256: d1d7e4cbd9e4923293423c259c188b4732cf287869ff68467bbb356cda631d70
font_01_sfnt_off00010774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10774 10896 bytes
SHA-256: 9675a44af2167f4eb24e8ac3ddac17c0adf20b0f6ceee84896e08064253ac536
font_02_sfnt_off0001207e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1