Malicious PDF — malware analysis report

Static analysis result for SHA-256 84265766dee8e228…

MALICIOUS

PDF

86.1 KB Created: 2021-09-16 23:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 514a5a96c0781e286937e94202c8cdec SHA-1: 33dff5f9f0dbc852c687b3851f6c5608dad17e41 SHA-256: 84265766dee8e228a96e495d1c6945edba5cb53e071a595316bdd98eb43a9a3b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting domains, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The primary goal appears to be directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=noontec+a9+android+smart+tv+box PDF link annotation
    • http://glttek.com/userfiles/file/16821787601.pdfIn PDF document text
    • https://andhimazhai.com/images/files/rojukesemujoriz.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161406a513a62d---80649352235.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/fotub.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/30251966552.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/54022012136.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a0b38ba84---71810791807.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/wujer.pdfIn PDF document text
    • http://surtek.biz/image/files/20150328_124214.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/92029650096.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/95486166586.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/riguvabotewiwuxawiw.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c68c4327b0---kusumekopidofajuw.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/janasiralepele.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/giwudut.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/tagiwirenomudijexirinesex.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210909_230837.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/41191019151.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/14576481447.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/3f0e6d508c5c9b1f739604352cf9c351/72364602468.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/wugek.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/cba5d5f4a90150a01bc73b7616168aa5/2247914295.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/48911405017.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/u591kqcv9p409ndsqoldptiba2/93055858785.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/nobinalazivadamekaposuduv.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_off0000ea71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA71 10940 bytes
SHA-256: 0f40e55ece42b24adbfab05990087065d133b28210ee1a52742b5e8caa4975dc
font_01_sfnt_off000103e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF2 18232 bytes
SHA-256: f468c1ab39fc648d9f612100c0c811487bb6a54550b5861c344b9aed86014e28

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