Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b31afcda473e20d…

MALICIOUS

PDF

90.5 KB Created: 2021-07-31 21:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29b2c6ed21ede67845c9bc2a85598e9a SHA-1: 9c42e57806a6c710ee8911ad8454878736e33dd5 SHA-256: 6b31afcda473e20dcdf1b02607c740dadadc7332c5a15ea1455a6fa445374250
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress sites, likely to facilitate the download of a second-stage payload. The presence of a visual download button lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=rush+hour+racing+2+mod+apk+android+1 PDF link annotation
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41f5c10436---17888314954.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160945f8912a6b---guwimiduderaji.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/d3a0dd0e20dffa651c15f7347a6016e0/74175147682.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16074500373d85---66271973835.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607833b7ec271---92297626979.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4e7ed69c2---venugoxuzexunaguxexe.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/50ff2868909f3178972e7331ce53ff01/318865266.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa1bc1b6df---dujilivolu.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607002dd80bae---31708348017.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/54393299225.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/zunitataburubajamefo.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757fbe681d1---77556032831.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/71427736186.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac757464df4---4835887830.pdfIn PDF document text
    • http://redfordunion70.com/clients/869360/File/12019390212.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/83142048404.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/75601302868.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5ef3c6aaa---65773824797.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/91679701806.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/rifakutugewusumuza.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/givunetediwetaguxavuzo.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/tebajitobizud.pdfIn PDF document text
    • http://vce34.ru/attachments/file/9369666953.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/dbaf637bf08cd4330975a67bcf27f73e/gigidiwevitowutexav.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90D 11092 bytes
SHA-256: 561ff6ff7ab2615c5d4ac58516337de3d9849118c7aaf592ccddc0bfa74fbead
font_01_sfnt_off0001029b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029B 17408 bytes
SHA-256: c26ae4aaf1d23b408f3ef35049d45f02970e2695746ce46efec2bb2e29da3e90
font_02_sfnt_off00012fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000147f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F5 5100 bytes
SHA-256: 5f446a02db64437a0b3d42bbd2f190dd58f995a39f9c06b0e84c372e4f8d529e

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