Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a16f450269b7320…

MALICIOUS

PDF

84.0 KB Created: 2021-09-09 09:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d91ba64833151db6941340bd6db39ec4 SHA-1: 9dfd36e77bbf665618eefd04ed711aeed6f14ce5 SHA-256: 9a16f450269b73200f6b65bbf52ebb990640aed451f5d66439c82d596023a9ca
124 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 websites or link farms. The ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly suggests a phishing or trojanized document. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, often associated with malicious redirection.

Machine Learning

  • Nyx PDF Classifier clean score 0.1682

Heuristics 5

  • 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
  • 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://groupementpecheduloir.com/ckfinder/userfiles/files/40056549727.pdf
    • http://kaiyudachem.com/filespath/files/20210908090310.pdf
    • http://schokoladenfontaene.de/idata/66016736104.pdf
    • https://pavillonwohlen.ch/userfiles/files/pimukefidax.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613900532833c---99508778696.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613562a18f76a---1983930533.pdf
    • http://ogledalata.bg/uploads/pages/files/zipugavidabusa.pdf
    • https://m-isc.com/userfiles/file/sitidugu.pdf
    • https://signatureshreyas.in/userfiles/file/77312980453.pdf
    • http://khojedu.net/userfiles/file/90588189261.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021941221476540.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613004c6aaaa9---tibojidonepojowobedazez.pdf
    • http://epmachine.ru/d/files/57614650215.pdf
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/98340651291.pdf
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/83283948725.pdf
    • http://chongros.com/userData/board/file/zuzapukosujomizajozo.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/zofivofibixukojo.pdf
    • https://alshuka.ps/ckfinder/userfiles/files/zevaxevedobenufepifevudew.pdf
    • http://lasfyy.com/uploadfile/file/20210906232221283.pdf
    • http://choinka4x4.org/cms/files/file/18637657079.pdf
    • https://khoahoc.timviec365.com/picturesfiles/37292493068.pdf
    • http://jinyezi.cn/upload/tevovodajipotipozijosabow.pdf
    • http://isvpro.com/custom/files/zomuxunajugupaxobifisofiv.pdf
    • http://villaroyalenews.com/userimages/39352266819.pdf
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pedonutarere.pdf
    • http://maslag.eu/userfiles/file/13843624539.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b45a0fd28---89441304235.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sonic+3+air+android
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115AE 16792 bytes
font_01_sfnt_off00012dc5.bin
a42ce23e8dc44b86c889e0c6f5749432b51d75bfd3f72d86a97eb178aef5eb60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC5 10164 bytes

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