Malicious PDF — malware analysis report

Static analysis result for SHA-256 40996ae618e0ce08…

MALICIOUS

PDF

78.2 KB Created: 2021-07-16 18:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10504133331e91a3fe8df8803d52dbb2 SHA-1: 34879839a2fb5f8dd3a173d2153bd9477afb29e1 SHA-256: 40996ae618e0ce0887923d0dafbf59c37155c3d6ee36fc88a1c9149d1e5ee5c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The file's purpose appears to be to lure users into clicking links that lead to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4277a19b5---51828409401.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d37e58eb2---63854343560.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/fb1335d7a6536affa123d46bf84665f1/waroredamukojuweripidosij.pdf
    • http://ccforum.kr/uploads/file/1624956958.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/734f2e0257959d1478a71de2bdd29a6e/woxawizowanenumurufanunik.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/90ac534333efae79fcd72cf23bf04128/kubenowimejaxodibul.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/tevutinirovawofaruvo.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab29a459bb---suzadamozajumulor.pdf
    • http://snsi.jp/image/news_file/3141505668.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606d44f9af24e---nafalakisudaleg.pdf
    • http://polipadel.com/userfiles/file/95611155071.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/k86t45fk2sui9jj59kulb0tpas/zakijawivurukojegugorewa.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d19d2d1845---lagelesorir.pdf
    • http://www.conectadoscomdeus.tv/arquivos/file/96960086461.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/eef986eabd80c02f4cc3915a04092714/xujib.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609268c300e94---bililimul.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/0d22c355305cad4c024043d30a9a7ebe/woxum.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62f111e7c9---22791845439.pdf
    • http://aceonlinementors.com/userfiles/file/furudotexudami.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b248449d584---39885875255.pdf
    • https://museos.comarcadelasierradealbarracin.es/ckfinder/userfiles/files/xulokaj.pdf
    • https://journeywithmypet.com/ckfinder/userfiles/files/92208290906.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/lth9n1h0fu8nd4cfu0essl1pop/jawuva.pdf
    • http://inspirationforexcellence.com/clients/66491/File/48553996245.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80d9544ff5---wefututibo.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2dbcbf38d---degixeredazorogudokid.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=mower+and+more
    • 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_off0000d329.bin
1f34114d1f6ede171255416eb113a0324805bb00410c7aa3a7ca59e5ab01c11c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD329 16216 bytes
font_01_sfnt_off0000fd25.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD25 16792 bytes
font_02_sfnt_off0001153c.bin
f9c85ec0b5b4624eaf49f9f3c7ae352bd28fa21e99e48d7c2448257ad19ac8c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1153C 10084 bytes