Malicious PDF — malware analysis report

Static analysis result for SHA-256 10444d6f3464165d…

MALICIOUS

PDF

77.0 KB Created: 2021-09-02 03:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 144cf3d0e2cd79b1bec8f4ed86711f07 SHA-1: 74ab5cdec4090750dbc7c885be8abb29e426207c SHA-256: 10444d6f3464165de26724330284efaa2951ac701eefaa5f5dbc9a104eb1c17a
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7df43397ac---sivuzeduzixij.pdf
    • http://kaies.cn/upfiles/210602122241364969anwpgl.pdf
    • http://aceonlinementors.com/userfiles/file/36515299956.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b782c85d350---jikesobusane.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/85f5e3e3a393e29093343c058284f616/weragakapimevigit.pdf
    • http://eltprof.ru/userfiles/file/robatavaj.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/d5134893ae161e849dd77f19e78aa49b/gapuj.pdf
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/bujoxabigujobiv.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/4ecaf4c2c34330cb9431d7998558ef65/muvizilekejele.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/fnc6m60esue95napg57v00601f/13461970207.pdf
    • http://whuntex.ru/userfiles/file/93067383805.pdf
    • https://subarini.ro/mm/file/51662096827.pdf
    • https://f27szerviz.hu/upload/files/66578780683.pdf
    • https://unibel.pl/pliki/upload/file/rukigak.pdf
    • http://hbleg.com/admin/userfiles/files/18582988154.pdf
    • http://orderbestwings.com/uploads/files/41118012916.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/4edac9eb50db38542dc374b668725fa7/bokedejem.pdf
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/tovoxixidividifa.pdf
    • https://cgeminfos.ma/upload/file/xalofaxewapalebuvuta.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/72pqhoauvi9smlrq5kbfnk89vf/33112875043.pdf
    • http://ifaistos.reality.gr/~triantaf/images/file/numufu.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/0082ff93c75cccbea17495e3646da22e/najanaxuzixuno.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f0dcbc821eda5cee5ce2fa3910c96492/nuwapedujivugepibi.pdf
    • http://yejida.com/userfiles/file/naluluzoluvexuwuvurod.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=william+shakespeare+and+biography
    • 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_off0000cad7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD7 16792 bytes
font_01_sfnt_off0000e2e9.bin
fae44f4a03f5eb521fb86c60ea1e0c4b7b324dd4b84ab3c3d0a94bae22792562
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E9 16296 bytes
font_02_sfnt_off00010cd3.bin
bb194f35b06e63e33738f337cd0dd11b3628f79163b51ee389e2b652dc25df28
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD3 11080 bytes