Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56efac72253c5e2…

MALICIOUS

PDF

85.9 KB Created: 2021-06-25 23:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13d9a2d38fea076db285f7a140b9dd36 SHA-1: 35196c0696b94abc62e59aa588cf1f0917ef7ca6 SHA-256: a56efac72253c5e2c66b0d4b924754afac9dca42c6c966c2ee937cde2c605786
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7f2b108b0---wapiwukasavolago.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0c0b6ca93---pakadit.pdf
    • https://tourpon.kr/FileData/ckfinder/files/20210624_1DDF142A6D169E90.pdf
    • https://susta.vn/userfiles/file/dimekaxasaveduludegikoj.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090120cbc83d---38694216621.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/8jc1l473nim9hvi97956id4ofp/67888890510.pdf
    • http://119hero.kr/userData/board/file/vexusoxavutuzewerulubojet.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/68185673210.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/5hd34k2saia3aavsnu48rq6dt0/8488949032.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/8d0745a24fbaa8653a1e3e66d86af8a5/7759698727.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/5154896dc5d060cc27c3e569740bcf4d/32582814925.pdf
    • http://aftckwt.com/uploads/file/jaxusuvukukuginimamudat.pdf
    • https://art-lamps-rali.eu/files/file/bigijegufivow.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608170ee0fc1a---jobujesomej.pdf
    • http://envigest.cz/upload/file/xixekibakejemotonozowub.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070573b72fda---67033948000.pdf
    • https://liniagdanskzydowo.pl/files/94538096585.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca326eafa2---87546621621.pdf
    • http://alarcon-v.com/editor_upload_image/file/64124333062.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608448cb7cf58---93204351731.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/ce5364772c21c818554a4b20d921a597/77644450395.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/2f77c6a45e4a8e00326f4a2dc9207d19/gojivugufuwajeput.pdf
    • http://armanetti.com/images/meluzekaj.pdf
    • http://mosjob.ru/images/file/28805215559.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=jeepers+creepers+2001
    • 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_off0000ee78.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE78 16792 bytes
font_01_sfnt_off0001068a.bin
7a2462ad06ce7e22a4dd1c478aa4ffa27744844d02bf1a831d66161a17093041
pdf-font-stream PDF embedded font (sfnt) at offset 0x1068A 17736 bytes
font_02_sfnt_off000133e4.bin
7dafbefe5ee10e16515399b10da7e334e0ad1c950b73c45f0c43324869d4615e
pdf-font-stream PDF embedded font (sfnt) at offset 0x133E4 10028 bytes