Malicious PDF — malware analysis report

Static analysis result for SHA-256 960bce30363a8e0e…

MALICIOUS

PDF

70.1 KB Created: 2021-10-01 13:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 36fcb4e6257ecb2d6ae0c2136bd8998b SHA-1: f91257097828b5fda10d74d923c6336d003f33fb SHA-256: 960bce30363a8e0e0c45878d564dd912d4dc39b47d81bc35605125147f6299fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm intended to redirect users. The presence of external URI heuristics and the compromised CMS upload link further support the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=pubg+lite+obb+file+new+update PDF link annotation
    • http://inimtrento.it/userfiles/files/jafarilagenokivinijuxekim.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/wedugo.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/kararosevogojet.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/75293562193.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/fixeso.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/bff990e00b4335fd4553dadfb2e0c583/24587028026.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/983853777.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/79201345995.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/17625466565.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/d4775b9ce9c614d8dfa721192d66dbe1/4102867245.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/gijuviw.pdfIn PDF document text
    • https://campermagazine.tv/public/file/4961649779.pdfIn PDF document text
    • http://cpviettin.com/upload/files/kosij.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/4461933474.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615385a4d2443---kudojenijotifedijapuzade.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210919040602.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/devetewuxagonef.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/78262741709.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/revapubikidovam.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/luwakijidafenupovowe.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136daef08427---97358687487.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/42724930785.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/29943440268.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/51352449078.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25E 10732 bytes
SHA-256: 2c73cff5fd204b143ddb630815bdb03c5dcafe6be82887a14e8e81d44484fee9
font_01_sfnt_off0000cabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D1 15352 bytes
SHA-256: ab6fef26eeb82c4957d99e63cec471d181d5ee6885288b05eb05e38e37782af7