Malicious PDF — malware analysis report

Static analysis result for SHA-256 11095cc74e2ed623…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 01:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd627e0f6f4675a7d5df71ec07f3d740 SHA-1: c2c99e2e544607f477cdf1ed8506c743e4e853f6 SHA-256: 11095cc74e2ed6230f220ed263ed313845cc5303c87f4a79d54ab4f556c6e21d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://radekslodkiewicz.pl/files/file/94013406590.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/facee8ee7c47eee0c12135a8d6ec5a7e/limazejafol.pdf
    • http://razaviota.ir/basefile/razaviotair/files/117467940.pdf
    • http://kleiberit.ru/files/file/fatesoduketigivogo.pdf
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/72233884225.pdf
    • https://weborder.cloud/userfiles/file///nemijaxidosizidadopaliz.pdf
    • http://cantinachitarra.it/userfiles/file/fiwowibilovixa.pdf
    • https://dalton-english.com/userfiles/file/doxajikevezexojupujagu.pdf
    • https://giorgiosantinelli.it/file/22510836860.pdf
    • https://ka-base.no/images_content/file/72632980105.pdf
    • http://plaschke-partner.com/uploaded/file/zafozajalapose.pdf
    • https://marcvandewiele.com/userfiles/file/3841319153.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136a8d956a01---74132298989.pdf
    • http://santehnika34.ru/images/file/61329621963.pdf
    • http://handsonmontessoripk.com/userfiles/files/zazarinuvagokej.pdf
    • http://fratellibeninca.com/images/file/89586021080.pdf
    • http://iknow.pl/files/file/sofupewukajudorajisut.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613baa2399691---gedokelafagofeso.pdf
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/99722379361.pdf
    • http://good163.cn/Uploadfiles/files/kabijodexupapugiw.pdf
    • http://creatinglifeoptions.com/userfiles/files/82441556574.pdf
    • https://kakakmanis.com/contents/files/47926751080.pdf
    • http://beta-rc.com/upload/files/gekejurexumo.pdf
    • https://truongthanhco.vn/webroot/img/files/74377339774.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=human+hacking+pdf
    • 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_off0000dbee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEE 16792 bytes
font_01_sfnt_off0000f405.bin
4885706e88ca5f5fc11c4df9e9a298dbd09e5247ca890f97b6637ecd2cf87779
pdf-font-stream PDF embedded font (sfnt) at offset 0xF405 10584 bytes
font_02_sfnt_off00010ba8.bin
9f4d27c94d5ec7ae3e7ee056924e879694828dfb3073db818fb01f76f703cf20
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA8 16656 bytes