Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d236e2f7fe3ea0f…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 18:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb9a2048b4ca02d0ca5524cea4f16d85 SHA-1: dfc819f8e49cf92fe71aa7bd7b131a28ad6b2f39 SHA-256: 3d236e2f7fe3ea0fea01f1f6dc7aceadccc92f4b76edf167d1f3342562c24f50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cructi.ru/uplcv?utm_term=how+to+record+video+chat+on+android PDF link annotation
    • http://webinaris.blog/ckfinder/userfiles/publics/files/91848418285.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0a7c3aeb1---80671764050.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090911032551.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/d9fcfa1426cb7e96b5eff9b8b85bf8b9/gaguxotekibudixisekepo.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/wurasegafuzoma.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/10185456734.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/45754028833.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/bukemo.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109072315173802.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/a08e711b02987324ac49a0697fbf08e3/sewekiwirowivezeben.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/70213844625.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109131850557188.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/22245014542.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/jetovowasofexudezirigugag.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/25808431869.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614039615cbd1---77179358104.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/59790662735.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/bikagodorori.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/luguguwademupupi.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/78933181886.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e8cf6eed933c7226b0817884681a2492/39231724663.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/sajoguwus.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_off0000de03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 16296 bytes
SHA-256: f8aed79a026df2ea55f2729f96e56acaf91e4f0cb499998baf362d798ba94c0f
font_02_sfnt_off0001200d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200D 10396 bytes
SHA-256: aec5c0b7940c57d1e0c199a470f4f484a7e68a9616693256d3ba4d2bbf79a786

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