Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e4cb5a20d0e588d…

MALICIOUS

PDF

121.5 KB Created: 2021-07-06 21:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ecddb8a4fd6612a35ac847cbc37c033d SHA-1: 1658095c621860a21ae88a82d2cc37a6d272db5c SHA-256: 0e4cb5a20d0e588d98b693485e7024c52466b4587ce50224e1228d929c72dc88
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites. These links likely serve to redirect users to malicious content, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b124a3692f4---mibix.pdf In PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/86297172456.pdfIn PDF document text
    • http://oodow.cn/upload/file/210616222516896584b0rz0igam24r.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/90604553429.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c3383830a42---10278029042.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/902vat73jq282sfa9ti1dpbvm1/82523281832.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/82890090087.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/l8pt9khvab5cmj2fn08vin74q2/21619832763.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021516352275861.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca29d49d27---46371254834.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/mpp597kqf7tbhap7ur8178v1j4/76363440427.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/46702322794.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/82107037533.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8ddc34a5c---73141475890.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba08176b0c---gotesufekawe.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/zaluwaxi.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b9209d2eb---30597866996.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/rinelabevaziniropoka.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d07b94248b---niwojetokovaderiwadumuna.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/14300048103.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/d4c0c4e9a973ad4bf8e32606e0424bcf/sudowepagovuzekal.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a4f74453---fetomuxugenadufizetali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=gizzard+chicken+in+malayPDF 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_off000175f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E10 10556 bytes
SHA-256: 5c5daa0fe7a854c7e438ede4ad55711c3a0e2f040c7d29e583e5b9e20209137e
font_02_sfnt_off0001a5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5EE 19928 bytes
SHA-256: 62a61269d76edb347a097b42a2b0abda78387f11a1b08edf4a391b13f0251673

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