Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a2d40e28e76bc7…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 03:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 622b385a8b24043823945a9a77012366 SHA-1: ec191db59718735fe518041ddc4485f2f8fd48a8 SHA-256: d8a2d40e28e76bc7b1f045d46e0f2ed9c070ab9bc8d0a4391f06e06004071633
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, and one specifically uses a UTM term suggesting a lure related to 'time value of money in excel pdf'. The PDF structure indicates it functions as a link farm, likely designed to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coretry.ru/uplcv?utm_term=time+value+of+money+in+excel+pdf PDF link annotation
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160f929132c1fc---22521366770.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/rgv7mocdsdt7selqpj3l1t7pgc/tonepavenoteteje.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/66576798841.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/747d2bb0d399394da62b6e422ad10eb0/3434787956.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/gedunuritulafizig.pdfIn PDF document text
    • http://gojjang.com/uploads/files/gulufapoxot.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/23095010084.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/9r0genqtpme15cq7h4q7oc7mo1/durojopojepakulim.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/kuduzozizevasu.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021080109371659.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/1c7vhonldeec99ah44k02qtboc/sodipum.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4b1e77f0a---burivagabasaki.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/345687fc2c51e7c28ae38f60d8c8a3bd/wikebadusewivalozufajapi.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/f2ad01bd17762b70a75b0256e2efd458/53588176023.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/6274063165.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/a2c0387969cd4e6cc9a657b059a453a5/bavagusosumogubiwepojeben.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c72b406706b---88438238964.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/e84rpojgssh02ltce6omjir10k/nedewaxerelaw.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdda181b96---75023798085.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/76249157380.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/zofegezogaruxexilobus.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/zorijoj.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/jebikal.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5acc972377---fokafabovimezid.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_off0000e3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A0 10760 bytes
SHA-256: b7b33b523d6b7b813fcfb5b51aa22c3b4cad5938c06a87fe5b79949ddbafa3cc
font_01_sfnt_off0000fc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11475 17088 bytes
SHA-256: 385510bc8958c80800a0ed32570f7df0f4ee5bc2cd2f51f2c86e619816a5fa52

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