Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed540e7b6e67082…

MALICIOUS

PDF

93.2 KB Created: 2021-07-13 02:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a208e351e39d38b41a49597606be6b5 SHA-1: de88612c0bf50e54e08552d70648c20b38d7c5b4 SHA-256: 8ed540e7b6e6708284da66b194009358331f08aed46adfbe85cddfb2e8aaf0d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm or redirection strategy. The presence of 'utm_term' parameters suggests tracking or phishing campaigns. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URIs strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=setting+up+ender+3+pro
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d260df32d96---revexilakiw.pdf
    • http://rustproofingottawa.com/userfiles/file/89159676222.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6796c2bf04---tetinofixuvokimuk.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/739ebd2065306c69ea3ae3b8b51978a1/finomolosivoziviv.pdf
    • http://sbs-group.co/userfiles/files/tunezibizolumazoruvis.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160910583df289---51815399193.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/ivpkrrd24b6ho0vvdab9o95k8u/zovobamataruj.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607476051d765---88878717452.pdf
    • https://idea-web.ro/app/webroot/files/userfiles/files/54329514323.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/8spm6m4g1hgba2vqknnqpg4pbr/58447266696.pdf
    • http://tajeer.co/userfiles/file/xozutamoxawodewimaburam.pdf
    • http://bronia.org/userfiles/file/jizupol.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/905d7d461278cd8a1d497b2c9fa09f93/jowixibulogovikujuramij.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/5378052658499223609d0a90bc4d92ce/zanerodularonu.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160942ea0e1896---54193708742.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a789f6d78a7---69816988381.pdf
    • https://istihdamhaberleri.com/upload/ckfinder/files/guraw.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/a5fd4be0c1a06d095694705d040d3d9d/tivipemoz.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/6d7ae58aefb573182dd4ebd7248c2f26/17016720420.pdf
    • https://dm288.com/slicice/file/womat.pdf
    • https://orrizon.ru/images/file/zusemawowakofise.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/t8c53uusnnesei1i6i62fm1s9s/kamaso.pdf
    • https://aplusadvance.com/naver_editor/data/file/monivopetopexiwifazabime.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cc0fe8fd0---divujowuvoratuverike.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_off0001078c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1078C 16792 bytes
font_01_sfnt_off00011f9e.bin
1905e4cca816f1403f76f3446bb0910da6bbe362d3605230152b8ebea53bc14d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9E 17752 bytes
font_02_sfnt_off00014e3e.bin
532ca1b029cc37dd5f415f5b3039c46566deddcbf6986b3fc1eba5e7e7b001a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3E 10540 bytes