Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3e269c736e7453…

MALICIOUS

PDF

318.0 KB Created: 2021-08-20 04:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0783ebef158bf22f21f3151bb2bc0e3a SHA-1: d66f75a4fc37a6f734f793a00df2a05d63dccd0d SHA-256: ef3e269c736e7453ba425c300bc22abd678c68471bd566ecd4a13b72b2bd77eb
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a phishing lure, including a heuristic indicating a password-protected archive pretext. Multiple URLs point to potentially compromised CMS upload locations, suggesting a mechanism for hosting and distributing malicious files. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an intent to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9122

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://3dtechgroup.com/uploads/image/files/95593109993.pdf
    • http://murphysbeads.com/clients/54316/File/10777144766.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f29294694f---susefameze.pdf
    • http://brava-ekb.ru/userfiles/file/40263046088.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nh0ifmi5fo3a8a3nt55t190qs4/30463365876.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/69aaecac00e1d225b296643f8bf05242/1866637796.pdf
    • http://meadescafe.com/userfiles/file/lajufoxotepugolo.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0fd35460c---letalu.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91f76a020---nedagajezagefaga.pdf
    • https://serviceservice.eu/userfiles/file/36578894858.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1bc8465f4---sagamuwek.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/30aef2f50cc4d53fad9e106cf13de5c5/bamekenumika.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/56a433c8ebf339b0d152481c392c114b/74980126944.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607155fe8fe8d---4451945929.pdf
    • http://allprintusa.com/admin/images/file/71866339599.pdf
    • https://www.alugutader.fr/ckfinder/userfiles/files/devexagitapaguwerati.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ca3f6049d3a00c3f83fc893c11a627a2/jonigeratuzumetedide.pdf
    • http://win-sonic.com/ck_imgs/files/wazagexojepovetawimirejis.pdf
    • https://inifd.london/uploads/file/tisebimazolosisojepopewin.pdf
    • http://www.mostenpo.jp/userfiles/files/xalujujikewagaferuziruju.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa9acaf066---ferizirefujisoporelotigu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=biologia+ciencias+y+tecnologia+1+secundaria+editorial+castillo+pdf
    • http://s292376414.onlinehome.fr/datas/imgmail/file/27373831421.pdf
    • 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_off000485ab.bin
93640532ebf6f525adeee3e0ee91048c966eca6e7ce86e276b29e6361d425baa
pdf-font-stream PDF embedded font (sfnt) at offset 0x485AB 18328 bytes
font_01_sfnt_off0004b3e4.bin
8b28e7346c8dfa1d06e43706e826db77361ee934db50e015c513da09af049f1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B3E4 11116 bytes
font_02_sfnt_off0004cddf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x4CDDF 16792 bytes