Malicious PDF — malware analysis report

Static analysis result for SHA-256 845f050a0c0457ae…

MALICIOUS

PDF

76.3 KB Created: 2021-09-16 02:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49a8592ee1c404eae34f9385ed5f6661 SHA-1: 4733c9485b26e72ea8eb9cf831e7f4bd21466df2 SHA-256: 845f050a0c0457aef52a8f3011c300609a5b56f010abd7342e8a21a1ccd03c3d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves tricking users into clicking links that lead to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161353a646213d---1816669492.pdf
    • http://0048.pl/48files/file/lekigusefuwisufasup.pdf
    • http://dpsszczytno.pl/photo/file/76187401724.pdf
    • http://bukharageorgia.com/sites/default/files/file/poteputusamofudu.pdf
    • http://ljjxmining.com/uploadfile/file///2021091306360881.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613c859ecf4d6---92234391140.pdf
    • http://elencostruzioni.it/userfiles/files/rokizimepokukogiki.pdf
    • http://rurisnet.org/images/file/44178363230.pdf
    • https://getracemirates.com/userfiles/files/89836159360.pdf
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/mukorabomewemofi.pdf
    • https://asiquim.com/ckfinder/userfiles/files/9892594780.pdf
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/44739830818.pdf
    • https://shirbandifelt.com/userfiles/file/danemotej.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ptubv1b4pculid8gnaq8ijtul7/26121966256.pdf
    • http://cachnhietwin.com/luutru/files/sezarix.pdf
    • https://groupekheidri.com/ckfinder/userfiles/files/jipimigixoxuj.pdf
    • http://mengnuanua.com/app/webroot/files/files/fuvesosadawonebenev.pdf
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rijivetijoderor.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301df24a880---kupemavevinemarapimij.pdf
    • http://kehlux.lu/userfiles/files/felefarotuxojokepuda.pdf
    • http://tyextractor.com/d/files/3729039225.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/755e49fa0a3c2a4a345e541d3d51e45b/dapowubowa.pdf
    • https://dbmotorbrokers.com/userfiles/file/7922950458.pdf
    • http://bellina.pl/userfiles/file/71042402035.pdf
    • http://www.ap-arte.ro/fckupload/file/2329124223.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=mxtube+for+android+apk
    • 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_off0000c494.bin
34695c65166327cb57ddb2a9fac6c1b666798c7a52196690f20a0c40dc8feace
pdf-font-stream PDF embedded font (sfnt) at offset 0xC494 18060 bytes
font_01_sfnt_off0000f3a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 16792 bytes
font_02_sfnt_off00010bbd.bin
3428966ed621fe8d698df634207fc30fc72157190b7d7f5577e29ec7b6db949a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBD 10704 bytes