Malicious PDF — malware analysis report

Static analysis result for SHA-256 b534eac4fd2d8790…

MALICIOUS

PDF

97.4 KB Created: 2021-07-02 10:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b5662573fece24cfa283299f99a63f76 SHA-1: d0caf8b12f5137bff12da11c97bbc5c5e8a636f8 SHA-256: b534eac4fd2d87901559d2c440a6a6d269120e09798b23098ad82203293dbdfb
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/eb9f4223a749bf0c1d0915fce338ba49/5307062980.pdf In PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/1j4esokddfpbtvisa6qa9dgrn8/53650130129.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16081eec082fb1---gokexejarimudi.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/ro2dipglpqn2br3gk224ka35fc/58736022108.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/gmcbaaemj4h8j778l6n7g4lkmq/89225696564.pdfIn PDF document text
    • https://steammining.com/userfiles/file/76600395144.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7489ecfc7---pifosizalutoje.pdfIn PDF document text
    • https://airshow-bg.com/file/5310235367.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/7815b3a83523ec013d5f4a501e339907/jaledejoj.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9d879b8ae557f23153041fd19bb04e4b/folomudamekopunapopelafi.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/83275826686.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c0002b4c2a5b9ce55922bd1717de2edb/duvepuwofuwogitejoli.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609883d04c90b---68820329882.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2bf56bf99---98979712526.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/rawewi.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/jp3j1ol5ct757r1lgg2slvk233/66715577109.pdfIn PDF document text
    • http://btfa.tw/upload/files/41167509619.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/foweromitisigenibag.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/rumem.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074975e0bd6b---91047712883.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/04c9b02cfe2ae20e76ea9592e4ba3832/19660756174.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/dobevutofidegoxado.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ad2cb77df---teweradizip.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/0686fe2e2791e555215f06565ba8398e/gipokemuvolagiteduzelasop.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a62aafd1cf7---kuzekogagarivetiwe.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/87423770974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=tristan+and+isolde+wagnerPDF 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_off0001163d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163D 20116 bytes
SHA-256: 9f8da7b1a66aab2bed710fca2f908a120b82e07a33a799c1001709bd16605dc3
font_01_sfnt_off00014706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14706 10472 bytes
SHA-256: cafa5881f17786d54280f6ff29c03336e9af6ec29856caac608d97c703d8dd71
font_02_sfnt_off00015ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1