Malicious PDF — malware analysis report

Static analysis result for SHA-256 6802936e35f8bac2…

MALICIOUS

PDF

95.3 KB Created: 2021-09-17 00:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 460b7e2b357f798376e0ffd130a89605 SHA-1: 1e4e017f3e700f5bb08f84be841b90766788910b SHA-256: 6802936e35f8bac22645afc5b02d8a517ff8396673354950cc5c90b9c993545c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to external websites, including those hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to obscure the ultimate destination or to leverage SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://eastoncn.housemember.com/uploads/files/legavagujuselone.pdf In PDF document text
    • http://work4shop.cz/userfiles/file/ladivexukafuroj.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/sukoximalezefawem.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/17923878590.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16143b450d87bb---laluduwixoxegamatidosolu.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b0994ccfa---kopepunopakinodu.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343e1043d28---95901777313.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/fiviwuwizixilewileko.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210910_171203.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132e0ba3361b---tugimegavuwi.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/siwuvusep.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/ruliranavivuxi.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/gukaguvijalutorajena.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/42208101920.pdfIn PDF document text
    • http://brlairport.com/images/file/30774100245.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/91700091040.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90777406274.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9d88c1828---biwukegajepozojototel.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///linugatarexadoxajufewik.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/vuvuniwotifiruxazifudun.pdfIn PDF document text
    • http://methese.com/upload/files/86895351482.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/xipimosawuguzosiwesudijok.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/gomanuxigifekokujaxol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=android+online+tutorialsPDF 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_off00010f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001272e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272E 18924 bytes
SHA-256: 2a08f4be60a004f8f8c26b0e90af6df97fc9fc343a8c723a8dc9f31da1456afc
font_02_sfnt_off0001589e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1589E 10324 bytes
SHA-256: b94bf29b58b1580b2c1481b3748881465d50973e2cc6945d5a7999228043da4b

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