Malicious PDF — malware analysis report

Static analysis result for SHA-256 29cf644f431e01c2…

MALICIOUS

PDF

88.6 KB Created: 2021-09-03 11:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 51208eddb851a42dd6d52f56163300e1 SHA-1: 22483db584a95e00a0485e9ae1e3b166b79dfc59 SHA-256: 29cf644f431e01c266be0b358203358fa574c455a8eeddc47f0915c9e317376f
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://szermgrt.hu/uploads/ckfinder/userfiles/files/manofogogimukebipezof.pdf In PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160738cda4e6df---wapov.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/14160812720.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc19f567848---38077783012.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/58299152541.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/xutorazazizejomifutide.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/86625991154.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/u94u171hfpgo25fpuufpsn6tet/76585926828.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/0b2f3d7dbe3e2ca0bc06c0d10f6e814a/30059941804.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/29d3t3fu33gg5akfe28knksj3n/26315825223.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126928e495c4---32286111947.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e8bec52c2---xuvikoxu.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/palosavofinanasawefusu.pdfIn PDF document text
    • http://rhondachem.com/d/files/96407379773.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/5209140013.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/demonavatamujig.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/5253467428.pdfIn PDF document text
    • http://cycling-software.com/files/file/tilovakogidaroki.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/vepumuz.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/najadobikufutu.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/a9e23389becbc818a0c2da8f1daf77ef/43526120155.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d796b42530---34683594797.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/zamulazetogibaborexirox.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//61951672807.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/28964205187.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/jibawixosi.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a5837cd7b5bfd784bf0585f732147fae/geduvonimuwup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=orthodox+tewahedo+bible+in+amharic+pdfPDF 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_off0000f2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C4 11072 bytes
SHA-256: 7d820dd21fdf8d6a50d4b2c3a9283a807f26abbe7dcb3cad24417e39ebe299c8
font_01_sfnt_off00010c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C26 18748 bytes
SHA-256: 0178426407a653c2ce1f41b7aa70acc7cd294772626956c6cd4c34d2d961ad81
font_02_sfnt_off00013c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1