Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebe92e5f3cc863e4…

MALICIOUS

PDF

89.4 KB Created: 2021-07-08 09:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eeb31afa305c92eec2081ff1ca5c131f SHA-1: be76cf957ee2a8c9344ce41438cc5f024616903a SHA-256: ebe92e5f3cc863e40ca1f133a9a5518496357ccb8f92c84a500ba59825eada18
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of numerous links on potentially compromised or disposable domains suggests a link farm designed for SEO poisoning or to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://yilip.net/userData/board/file/11551228242.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608445cfee920---60961971696.pdf
    • https://mecaniquekd.ca/upload/file/zetikujudonone.pdf
    • http://yongqingtech.com/d/files/86912620303.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/ad32f6ff243f577021f8df1c6040493c/96736666882.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16085c2ed69d4f---40752350670.pdf
    • http://vimbark.sk/editor_uploads/files/namixofunewikuganabered.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c895fe803a---bokivoruzavexubig.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c94bd7da---88260034067.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073eca9a8e36---nojiv.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/2d0h1mgvjnoniq6btje9jn8rsh/xizexafepinosak.pdf
    • http://www.blueoak.fr/image/file/duzufogaxujarezoponigegi.pdf
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/91457537389.pdf
    • http://palami.by/images/file/raxesuv.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607616625f706---94186966187.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/1n4qefd551s0t3sv594idqfcp4/xapolozesanuri.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/f683a4ea28e78fb64492dbe248d7d1f9/21762383028.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/966d383dd5b83747d763af0cf513fde0/zaxejesafiv.pdf
    • http://hoaisonland.vn/upload/files/62792006005.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074688273439---51397445068.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a7fc36711---85397511818.pdf
    • http://kokalietudarbnica.lv/files/files/sovuwafufobukux.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=normal+pulse+rate+in+newborn+baby
    • 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_off0000fd54.bin
d0802ac56f059a68e86e63f01fd0bc4df65541c0f90472c5738f26b75ef5e082
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 16360 bytes
font_01_sfnt_off00012792.bin
dfa24e1001cb6d25a2f029ae1e58697902d58c527650e056688752a62c3b73b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12792 10832 bytes
font_02_sfnt_off00014065.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14065 16792 bytes