Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a007310fea07eb7…

MALICIOUS

PDF

85.9 KB Created: 2021-09-01 22:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b0d56129b37122d72ab1c2e4806eff14 SHA-1: d7eeaf8e70d839bd8c6abd17c40eb0d3a4389aac SHA-256: 6a007310fea07eb784ea706c23526644de4e6c455b7d8b8d11e7488ae2299460
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm or redirection strategy. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine its likely purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bursac.net/userfiles/file/kifedowijenoziso.pdf In PDF document text
    • http://marinapogon.pl/upload/file/86629381861.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/xolipivilipudabobib.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/0d3d8231173d531a219939b478bd72a2/95742403918.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/i1bb6shpu0g0mk4kqqci45a471/bipudakaseburujogopama.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/6301741801.pdfIn PDF document text
    • http://metall-press.ru/files/gobuzolagepipokoja.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/sumanuzogiredutopavujebar.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16120438cd8c6b---99751131789.pdfIn PDF document text
    • http://princeverma.in/uploads/files/funesazagiboxume.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/52449362132.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/44930216823.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/wegolamejedeta.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/29773754610.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/vetelux.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/h4pnloraebb3i1gsregnu0qhib/68268234201.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/11400c3c6e8bd531ae8ac397918d03bb/dubenebex.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f08c1950355---pagomimurasiropinu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608700ba6946e---dunopinakebaxetaza.pdfIn PDF document text
    • http://rafaelokazakov.com/file/kakezuvug.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/71af93825d83fca1a75be21b40fcb5d6/40565893104.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-23/20210623145609467231.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/88386092843.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/87790450938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=matter+word+search+answersPDF 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_off0000e6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AB 19828 bytes
SHA-256: 304f9ca01fb81276b511d809e35f63de87d47499de75ad3b9bd7fd4c362e09d6
font_01_sfnt_off00011a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A89 10408 bytes
SHA-256: 47483b665149ff24486ce767047a4abd90b0661881d52de251ccbfbb712fafb7
font_02_sfnt_off00013227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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