Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd532a13b5026a9…

MALICIOUS

PDF

77.5 KB Created: 2021-07-10 09:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 134afaa4793f466c4c3b39a03ed9b6fc SHA-1: 0513940844f2f9c27ee5b0b1cb07ef7c079bbcb1 SHA-256: 9fd532a13b5026a9f68c53e2581b7fc2a44b5c8d1e815b4c4bcb94b457be2e24
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS upload storage. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to lead users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=chill+out+jazz
    • https://accesoriosalmayor.com/images/userfiles/file/tufevuliti.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8b245ddf4---47312324552.pdf
    • http://pokorny-podlahy.cz/UserFiles/File/tovowugevup.pdf
    • http://nappsa.org/userfiles/file/mosazis.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160705acfa95b7---jodusab.pdf
    • https://maydangson.com/vietkiendo/upload/file/45449849350.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cf26ddacd98---wijiduvodef.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aea3a7f447---72883037290.pdf
    • https://nothingbutsafetyglasses.com/userfiles/file/76732357710.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d1b6c9181b97903571f3ded2f3e4c442/ririmapu.pdf
    • https://repare-ton-smartphone.com/userfiles/file/vixowe.pdf
    • https://mimpishio2bet.com/contents//files/47885574043.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/91be832d9fefa86e00994cf8882626f7/sizusafiluralavonet.pdf
    • http://ikhmongol.mn/ckfinder/userfiles/files/kojasujirifujalowekajavu.pdf
    • http://redigonda.it/userfiles/files/ruxiliwideremif.pdf
    • https://maribon.net/app/webroot/files/userfiles/files/vajidesamopejoxabapo.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5af29b399---46619228818.pdf
    • http://longhornrings.com/clients/0/08/08da48574b41509ac7bedcf2500dc652/File/4241525584.pdf
    • http://asja-doll.ru/userfiles/file/juriwixufev.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/vep7pq2gu6iuv09bdr7od2f4fo/juvefotezomav.pdf
    • http://nemdanangpho.com/uploads/2021-06-18/images/files/jijojinixarore.pdf
    • http://yaqeen-eg.com/userfiles/file/16798631051.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f48e57a507---pemimetovusapeximitalow.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_off0000cc28.bin
b7cbc873ba35f8ecdd77338c5d595a12ff2efe9859699502a64067100b83b7ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC28 10024 bytes
font_01_sfnt_off0000e284.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 16792 bytes
font_02_sfnt_off0000fa96.bin
7efd9c163f4d0089379f14864b972f8fb793d2d935e4fe32845f0688a161095a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 18360 bytes