Malicious PDF — malware analysis report

Static analysis result for SHA-256 835419c659ea7b9c…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 17:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 109951467987e6acb2587d4975d41bc9 SHA-1: c4af2d4a506aca49ddf8b8e9d5386860300d1a85 SHA-256: 835419c659ea7b9c365c3d75b65a146f5025bb62f7c37cfac828aba6f706f9e8
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=the+case+of+the+shoplifter%27s+shoe PDF link annotation
    • http://nage-z.com/ckfinder/userfiles/files/55611910383.pdfIn PDF document text
    • https://abeess.com/userfiles/file/81810579081.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/81509072843.pdfIn PDF document text
    • http://budka39.ru/files/61251588491.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/bf13c34bf1831b4b285abb5dea826bef/xosuwemulasumo.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/sewadunanepibiba.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/94865105005.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/k8bf0bsgmidvbkfca6248uabq0/gufakenex.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/zigosobobulaworotamekuvo.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16119c6edec60c---59062834523.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2827ef10b---zulelozoxokumugupil.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/78683682479.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/13707076607.pdfIn PDF document text
    • http://berbun.com/user_img/file/xudugopeze.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e7625d22b60bdb31ff2e4b36614d265e/68096363868.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/molafepipamor.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/b9f7cd0cca3028db101d5d4e9fd3bcf6/vurunigujonipezezel.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/wawewusifera.pdfPDF link annotation
    • http://mirai-kankyo.com/userfiles/files/teligurikogujul.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/6a054nnjp7h3clkhipq3c4ocl4/65806392144.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/ckbks5ttd1ssi7e3lb57pkplui/54823460763.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/276f9bdaf0836b7ac0000db2222007f3/7846739577.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/19662738051.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/60246213206.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37A 18408 bytes
SHA-256: 1777bd6219022bd869be7553a2f60e9f0781b38a349ae749db5cd5428a4859b6
font_01_sfnt_off00011349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11349 10472 bytes
SHA-256: 4f1c9107e67446f184b140fc74332d55c29b14dd8cb1663b0fb8933101505ec8
font_02_sfnt_off00012b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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