Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a2b342b84478237…

MALICIOUS

PDF

69.7 KB Created: 2021-09-16 23:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aef90c113cac75b091559f566fca4cb4 SHA-1: 6205f25bac88f2507a7576949b1c05fff06425a1 SHA-256: 3a2b342b844782375a0e86627f0386be7e2478dddf65fab3c29e6deebc6a291f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The presence of external URI and link farm heuristics further supports this, suggesting the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smidgel.ru/uplcv?utm_term=gta+5+for+free+mobile PDF link annotation
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ae88d26f2---jazodajezetubulutepu.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/26508137219.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/fuzisujabamufa.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/nuxanarejanebudanoxeke.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210916032805.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/jotopogosemomevo.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/sabelatozovizusuwamokobu.pdfIn PDF document text
    • http://0048.pl/48files/file/27022673028.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/romisigepewujiligin.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/91243155783.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131022ccedfe---wokadikafubi.pdfIn PDF document text
    • http://camonetinternational.com/files/file/jariwusixatotisas.pdfIn PDF document text
    • https://x-software.cz/data/file/wawugoguvi.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/29803954049.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/8875074756.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/rodunugug.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ed4b77579---37317361836.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/29423952039.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/51949915108.pdfIn PDF document text
    • http://ukrfirework.com/images/file/38711172687.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/88005190640.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/zavonofipenagokimezurizi.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/mamelavedalixewulevet.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_off0000b56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD82 10416 bytes
SHA-256: d4b675f8dab20581a9c969e2da79c73c95a52f0db4edb3e05b7eb0a4cdd15ddb
font_02_sfnt_off0000e532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE532 14452 bytes
SHA-256: 26a4efce9c85648a989fe913aa6f7f93af3433b41de344bba14f40f0388b85bd