Malicious PDF — malware analysis report

Static analysis result for SHA-256 894287b2971cbd34…

MALICIOUS

PDF

78.7 KB Created: 2021-09-02 01:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f00a577dabad940363927a44de50171 SHA-1: d072978a2e41b6c6a20d1c03eb7da420add15052 SHA-256: 894287b2971cbd3488e82c1db6871bb8fba9bd314c1473a1e41f82b2f27df3c0
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 are part of link farms hosted on disposable or compromised domains. Heuristics indicate these links are intended to redirect users, and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely phishing or malware delivery. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=linear+factor+example PDF link annotation
    • http://dreamcatcherltd.com/userfiles/file/melabudule.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/3659871616.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-9/20210609053311594942.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/41204864607.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/13602180724.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/lugelud.pdfIn PDF document text
    • http://teplospectr.ru/images/files/11909762877.pdfIn PDF document text
    • http://minerva-collection.net/files/files/teluxukesekutagedave.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/maweduvokola.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/8e49f8ccbee1a3d1cb0abcee141d0d4d/46417334775.pdfIn PDF document text
    • http://islandpointfl.com/userimages/5026123478.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/28401264189.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/33182557710.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/zuketoradevomidusolifego.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/i83kecree4lrpoqco5b5ussb4n/juwozilufude.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/qplsmfveb74kbhlfi3q4555rf7/83019833496.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608506a0478cf---74727799146.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/rexemeloborujakesaro.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/71423c6477f7adc07e1c96db7d47b485/19613364509.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/16268980308.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/47062475070.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612c20ec5ddfc---21604148658.pdfIn PDF document text
    • https://begili.com/uploads/image/files/59885288387.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/6954e0e08c5aacb1b99bd41d0fb9b5ec/lusilerinexoreneperup.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_off0000d393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA5 15896 bytes
SHA-256: 94ab413d21e6ebe24edf387de54f0c1d8361ea26708aba0201bbad429c87d742
font_02_sfnt_off0001148f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148F 10532 bytes
SHA-256: 20474cd29d2723e1b10aa15e2ac45376acaaa0ff8b6952bf63a7798313bc1c42

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