Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5260dad0bf06bd…

MALICIOUS

PDF

91.8 KB Created: 2021-07-06 03:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f3cd9a5dc8be838e22db663427e2305f SHA-1: ed88fa032e661d87332314f63c35c449fc665cf1 SHA-256: 9b5260dad0bf06bdfc65d536ffd82c23b66824c791eea2db5f97497e7e793b30
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm intended to obscure the final destination. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent, likely for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/b2f387b0d7c4147e62af265d71fd1250/zokufeferapusizukipatogew.pdf In PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/taven.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d045d26bd0---8003163873.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d25d0d52742---zomovesexuzipivufomaxidom.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/n0v1gd4n6ik3an1r6mv8n65duk/15773517550.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/2d49c5c10edc7e150727d993b28e45e4/42712682212.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/77794417854.pdfIn PDF document text
    • https://schmitz.cz/res/file/50812098159.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/bml1rrj0e070fm52nglfnp5t8k/vawokexu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701c69dcb43---78642356191.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16073ef48cbacd---tekezutuk.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/99924166527.pdfIn PDF document text
    • http://fitviewer.de/files/file/39437044373.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/35963485176.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c52038b1ace---15433927237.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/b7sctpji2096aki75dhq4740bd/25463486919.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08daeb3f0f---81866029211.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/9ab13bfd872576e80dea9ee0d7b2c638/nipagobigudixawegarine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=student+comment+samplePDF link annotation
    • 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_off0001051a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051A 16912 bytes
SHA-256: 7974421e5117f05dbaf1c1ff64b347ec390e4d8f71ff819876401016d7cedaaa
font_01_sfnt_off0001309b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B2 10656 bytes
SHA-256: 434cdf693cc59f7ea1ff8068d2a388a829921b951e1e2660ba0f56f4f1894389

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