Malicious PDF — malware analysis report

Static analysis result for SHA-256 415b8d7a3060625c…

MALICIOUS

PDF

99.5 KB Created: 2021-07-07 03:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 85a3f8d79327d57c292119d6865a1451 SHA-1: 2e822c644dca2cd17e51f266e516c4ee17f471c2 SHA-256: 415b8d7a3060625c14da9403fdc079dc3aeec82834d9053b33e84a78ec3256bc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of these links indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://medvor.ru/uplcv?utm_term=lineal+champion+meaning PDF link annotation
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/08cec74d62e14110ce0b51820be89c58/soxasovopilajujeko.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/d72d5de9fc8be80307266bfc15e53aeb/selojexegumajasado.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093a83f36e1a---76671181529.pdfIn PDF document text
    • https://baongochoa.com/upload/file/80500166906.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/kavoris.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0ccdbd215---movoxefazeket.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082080d9429a---xigija.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c72fe0b61f06e6ed9ae8725fc4391df3/64467672717.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/qj756npi10mv51mdj8g6gdemqt/90453871664.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccfaa137f3---39681691712.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/59397202208.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/xegisapu.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d79114b04a9---vegalepazepizi.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a957130088---fezunamisasa.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/k925rl950e2tu8noaglc4u3t2f/nelusoxudowozo.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/vevawobisutilijalu.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/598f2a61bb704320ff912399f20f259e/85821414417.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b7e29b936b4a3ee9e14fc9a6bde6f97d/pojubidutabik.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc01e7ec173---76250865803.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085518e66a0a---53021703983.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2bb6c7052---21352271582.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/20149435172.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/78032270845.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/3d6b8548106579be6a57646577c539f8/37434691139.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607159abd5257---midajinirituvixixivoba.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_off000121ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BA 10412 bytes
SHA-256: a04cdcb6e43ebba91b7497d92bf941e3bac9110299637662f87160b5cb95c36f
font_01_sfnt_off00013903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15115 18240 bytes
SHA-256: 35c4b4177024493091161dcae4e6f7ad448204f94f1c8744b1e4c3227db8f2c6

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