Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c56eacd82f34a6…

MALICIOUS

PDF

76.1 KB Created: 2021-06-27 22:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4903e941c25b2657432bf3aa31baddd SHA-1: 256988d454269ec616bf5581f12fe86cf6e601e4 SHA-256: 36c56eacd82f34a6314e3ec71bb1fc399cdbd01f5e5b83a84b616749d4d13cac
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external resources, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download' button heuristic further supports the interpretation that the document is designed to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=how+to+hit+a+driver+off+the+tee
    • https://nanyangtextile.com/userfiles/file/zusipadenalokupisova.pdf
    • https://cupanghitam.com/contents//files/kowasonabamab.pdf
    • http://kelvista.lt/images/files/50459053597.pdf
    • http://tpdw.pl/userfiles/file/tilawuje.pdf
    • https://noblacklist.pro/web/img/podborky/files/vewok.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16071ddcc4f29e---zetezobetatajara.pdf
    • http://gongotour.com/FileData/ckfinder/files/20210625_33A6562387BFF2BD.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b56a63b5f8f---49774049594.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/85df9d9feac770222811b30c728e8598/22683493450.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a450842cbfe4f8a164c82f80d9748921/lotok.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075cc36dedb1---jibilobovifowafeba.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/muatu928tbulgh88nrllj8hv2a/tisarozabetujixujorawumuv.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607052d9ecbc4---94909719119.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076a948cfc2c---xejafafewudobirofoz.pdf
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/lawuzuxamutiwizo.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e27354df29---xiduzufufowuj.pdf
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/pivuwezinubefemugeraw.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fe550f1e6e97630c7bf7087e43aa8771/fuxosararedopo.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f10c424dc2---gaberigegov.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb4a6a2f21---vimiza.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/d7dbd11e76e4bd54a7be75fbc85363db/66185167076.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9cc272cdd---jegisamukoburotipuwelixu.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/si3ro2nd21lmeri778l1k0ceua/34670838235.pdf
    • http://dvarenda.ru/upload/file/52151783953.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_off0000c9ad.bin
ab26b5791e80d38f660094db0fc006b7f486b0ffae8ea9f9c845d400cbe2ac88
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AD 16372 bytes
font_01_sfnt_off0000f3e0.bin
81d3b3df97fe1bbe7f1262eb8925671613b6c2f1efd6f974bf13564cc14de50e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E0 10276 bytes
font_02_sfnt_off00010b29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B29 16792 bytes