Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec79fdc7f62620d9…

MALICIOUS

PDF

81.2 KB Created: 2021-06-27 23:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b79874c6f343843ab365ea20cc4d813 SHA-1: 5be5722fa548d881ec83f71394f702892cab947c SHA-256: ec79fdc7f62620d93be304e78c7b3f4f5d73286cc1fbe18f29b9dbe536574b2a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, some of which appear to be compromised CMS uploads, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://menu2uplus.com/images/file/80093132841.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee07958fc2---80868506772.pdf
    • https://kme.pl/global/app/webroot/uploads/file/16225595572056.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79da138442---70738162991.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160d19b58c45a2---wewibotulolo.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ce61aa12f---bifopuzot.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/71fb51cbbc4a9178d01a27d8a60c62dc/juvutevowonojevixin.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16072a3b1539ab---relopamiwiwevululedidima.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b06e49c9e2edb3f0ff60bd566b33b7eb/2072597051.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b802c6b6b06---kaxavowepu.pdf
    • http://wsm.hk/images/uploadfiles/file/rijumuzasenaxadopalinuxe.pdf
    • http://www.ximangsongthao.com.vn/app/webroot/uploads/files/50977167120.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082fed26ec93---fapumapinuguz.pdf
    • http://school19-zav.ru/userfiles/file/pafopujen.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/a8c11a89645bfec57b0ca711dfbfe3c6/94212537905.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/379e3493ea1efd35c0db4ada2607c33a/45016861721.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a319044b7fd---tobifitej.pdf
    • http://royalwedding.jp/images/blog//file/ramajaxaza.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b051872b832---wozevebonizuwosi.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b62b5c26bb0---70615229348.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a16405154bc---9600484428.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/e1b622d49163603f2e85860db0ce860c/91282018499.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce927756e49---taratepujowepeje.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=3rd+party+release+form
    • 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_off0000dca0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA0 16792 bytes
font_01_sfnt_off0000f4b2.bin
92fdb88cefd2dc7715760a8845bc33c465e2f543e351bc421f627971decc3703
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B2 16572 bytes
font_02_sfnt_off00011f46.bin
4355f5f2b98e3592df434b717f0b3081247b5470fc55a8651911c9eed260ada0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F46 10652 bytes