Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b3bde632876e77…

MALICIOUS

PDF

90.3 KB Created: 2021-07-01 10:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4f17da63c579e33b50cae992ab8aef4 SHA-1: c04dc6d352a240af6b3cf63829be8cdc730c19e2 SHA-256: 67b3bde632876e7741c1c759bef482669e616630a1c0c3f5e4f9aaa39e7a0699
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a tactic to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://akvari-um.ru/userfiles/file/lapekewofulekegujali.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acab0a0906---lixozopedepepalozuji.pdf
    • http://szao-spb.ru/images/news/file/63890641608.pdf
    • http://jevades.com/aircraft/fckimages/file/51116928607.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea6d53c67e---jirovapumefezexipa.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/fa7b4e50c13fce3bb8f10b70b20c2c80/86641547116.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083bde2a0a5e---29381664474.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b83e56c6a---62005352115.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/aefc0d64fd4e9353825dc886127cb167/xibidofisujojotijos.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/6d9a86509ba98b73aee1f71d0438ebe4/supigojiruzevufubadose.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e13ef907e6---24021220143.pdf
    • https://aihr-iadh.org/uploads/FCK_files/file/dakajitiwa.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6e1cac0cd---rinef.pdf
    • http://snap-drone.com/userfiles/file/38457177791.pdf
    • https://altonika.pro/files/fck/file/ripoxazubobenobazajax.pdf
    • https://b2cexpressdemo.com/userfiles/file/48699336211.pdf
    • http://onlineexpert.in/userfiles/file/89582645045.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16070b1df0a707---47242582054.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/52f64c2b703461257913c107fffc0dd8/wijofot.pdf
    • http://inwallendorf.de/userfiles/file/61053804276.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/87981682838.pdf
    • https://newtech-utm.pl/userfiles/file/jagonobilekapudo.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac52dc0019c---bepitapuk.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070dc00bc46a---88056726620.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea8d8bb01e8c44bb5e1c55c666db4157/nabiwepimebaletifixebaju.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=james+bond+release+date+no+time+to+die
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f733.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 16792 bytes
font_01_sfnt_off00010f4a.bin
7449a540434ad0874458fe29b9e49050b37c90775c1ff14156e716d76f1f2004
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4A 10540 bytes
font_02_sfnt_off00012742.bin
b8137008f42a978040ed207ce5a4a80633d3d4525450c6af94eeec5f8c259743
pdf-font-stream PDF embedded font (sfnt) at offset 0x12742 19240 bytes