Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a410b90d742e1cc…

MALICIOUS

PDF

81.4 KB Created: 2021-08-27 21:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4be73c9c9864dcacad9a507c78e163ac SHA-1: 151ff1cc7d00ed32d75b9518f90f47f0326233f2 SHA-256: 0a410b90d742e1cc499db304e4b77549691c20a205fed2d86540175ba31835bc
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://abwlargo.com/uploads/files/zodurefosigarepujag.pdf
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/gavutur.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74910963f4---pojivulegejinagirazegifi.pdf
    • https://defaico.com/d/files/84318355407.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db1d3a12b56---8085514351.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc6956ae76---75350586335.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ecac8b16504---74225756084.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/bb4e2de40a733da227a0806bf384bd28/3277219447.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a47fd735524e81a056110d768203e4ed/59161323950.pdf
    • http://botosani.ro/img/uploads/file/namixituzuratenavisoki.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/2c7223e7a47ed219cfd377a60b3cde96/87976116770.pdf
    • http://heryeryesil.com/resimlerfiles/41393522088.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f6e23a317d7fe01c6ce67e22ebc145ab/23750700476.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16086f03d534d1---38153160485.pdf
    • http://kibbkw.com/uploads/file/59934277053.pdf
    • https://samngaimarble.com/html_upload/file/62676752576.pdf
    • https://aljazeerahpetroleum.ae/userfiles/files/fozegodiguzavagavejisaluw.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cdd255733---390685734.pdf
    • https://democv.associasuite.com/imagenes/contenidos/files/51923652567.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a4f7bd9e9---21913547252.pdf
    • http://paroissedementon.fr/upload/files/90430107091.pdf
    • http://anhbanglaw.com/userfiles/file/niximigunulidar.pdf
    • https://barcelona-health.com/files/galeria/files/95178996659.pdf
    • http://kurier48.pl/files/userfiles/file/tupovemojixakaxafa.pdf
    • http://w-f-l.de/user_img/file/81805041685.pdf
    • http://phuquytravel.com/nguyenvanlinh/files/22106707929.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=longest+case+of+hiccups
    • 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_off0000dacf.bin
589e325e2afb98f5e2c7d4dbfa65ef2b0b80f960d69af574c3adf548d81de2f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 17124 bytes
font_01_sfnt_off000106fa.bin
06b4bc950cc4a13e2ade7b0a7792789c93e82d78069a4015076cb74419e61652
pdf-font-stream PDF embedded font (sfnt) at offset 0x106FA 10672 bytes
font_02_sfnt_off00011f71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F71 16792 bytes