Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a369f642fea93c…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 03:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9489668014f88858d5cf70a56ac9275a SHA-1: 7b1a2bff306c7472f956d60453622ed4bcbb8188 SHA-256: f5a369f642fea93cdce2b74b0570356290b2872f131000ca0704f009efe78ba6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised WordPress uploads or disposable hosting, forming a link farm. The primary purpose appears to be redirecting users through these links, likely to phishing pages or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=jeep+compass+2013+repair+manual PDF link annotation
    • http://highendschmiede.de/highendfiles/file/13380704750.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/33296759421.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/zilogitawotikezuwasavub.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/ffa0085be628100d5d1495aa88f58970/82464568086.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/nosuza.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/negogobituvizalos.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/90494775026.pdfIn PDF document text
    • http://tencanpowder.com/d/files/resazaxekizalezeruzage.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a78c1a0cdae---71921972298.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/tefofegofijezirobeweb.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/36705103443.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/61860827609.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/bivapat.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/vuzozogu.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/mibasewalokob.pdfIn PDF document text
    • https://edusfera.pl/upload/file/jimemederulajub.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/kt4a842v3a42cchh4jbq8b1bv1/74761354652.pdfIn PDF document text
    • http://yuha.be/_files/file/bufokomutobawobox.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/liwotinugezad.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756f7db0c6b---44690322524.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/cd04ba71f9a7cbbbb8f0876a490a952a/vawosozebetotujifavivit.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/78b73225649a4a7c89a62b92d8ff4858/55243121616.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/gojisizibumu.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb785b97f27---91928119753.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/9gr1ernk5s9v294iq7qj03lhep/dazij.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_off0000cfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD9 17440 bytes
SHA-256: d0c13c322bace71bebc5d62210d8c60b869a08e5ae5f47c3892190433c973007
font_01_sfnt_off0000fd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11577 10992 bytes
SHA-256: 20aa687de16afb5c587f78cd9e33aeb928e826ab46b973425f7f7c56ac790b57