Malicious PDF — malware analysis report

Static analysis result for SHA-256 db36f246e1e65ba1…

MALICIOUS

PDF

77.3 KB Created: 2021-06-28 15:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53e25509811c63b3be4b17324811fca4 SHA-1: dd1a19acc4f30c96d507b8f2a1d45135ee44fb92 SHA-256: db36f246e1e65ba19795b1c60f91fcd322c6993e0af8a7d1d8af4487ff2dea29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites, several of which are flagged as potentially compromised or part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. No scripts were extracted, but the presence of external URIs and link farms suggests an attempt to lead the user to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://people11people.com/uploads/File/21607398447.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090c39b02f12---wotupowekibabifosezira.pdf
    • http://files.ibiza-ferien.de/file/fabuzutujelivusolozadak.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/mikivoxalezoji.pdf
    • http://tubietelbar.hu/uploadfile/10923254267.pdf
    • http://djapm.com/userfiles/file/ferakozizixapenulazor.pdf
    • http://fanti-fitness.pl/uploads/assets/file/29115429104.pdf
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/n99sk0s44ur3pgu40llcs8qefr/27260541079.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b5f5bf8e66bb624b94563f5cdd01d274/dumosedomi.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/bk09g2saa54ndns7mkqkq8hfoi/41791489105.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77cb1d36fe---konozopiludisisef.pdf
    • http://ridendo.cz/files/file/pifagepubufutu.pdf
    • https://responsible-tourism-alliance.com/content_file/files/91020800651.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/e362dab6aef403f70adaf65092172d78/wuzipuxefevimuw.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088807fde467---bogujufewo.pdf
    • http://proxima-design.cz/files/file/8190645446.pdf
    • http://currycornersugarland.com/admin/images/file/98823958846.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071944b04ff6---5338517223.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071978e29fdd---tonanig.pdf
    • http://indago-rovigo.it/userfiles/files/45173536510.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945b67171ce---fugopubebotufizoguziziri.pdf
    • http://maekuangudomthara.com/ckfinder/userfiles/files/famarunesof.pdf
    • http://cn-noah.com/uploadfile/file/43861708431.pdf
    • https://hiddencliff.kr/FileData/ckfinder/files/20210607_7B995D82394D721D.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=is+there+a+way+to+remove+pages+from+a+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_off0000cc74.bin
d3a0a947e184ee29556ec79f38df6b2d54d3c78f6bb7fe981af3b716c8d21160
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC74 16220 bytes
font_01_sfnt_off0000f63b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF63B 16792 bytes
font_02_sfnt_off00010e52.bin
b4f6b2c8b044dffeab0cbff03791199d4fc1e8e8b1c3b43f092cbfca4bbf92a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E52 10920 bytes