Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf4ff978f89b829…

MALICIOUS

PDF

157.7 KB Created: 2021-07-12 22:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4621a817d33e8dedc95c722953acee8e SHA-1: 2556c0f1ddd7dcdc60b16285d38148a877e6ae8c SHA-256: cdf4ff978f89b829e5fe965a8d58df44967dedbb7f9bfa3d864ef7504bcad1f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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 https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/d11766385e6ffbd66aaf8e1a81bf50dd/wuwusesilatokazesojad.pdf In PDF document text
    • https://acrgroup.nl/userfiles/file/24797295420.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7a07e8204---95097891652.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/31acgt2k91hoi4kblm75h6akj3/gulunut.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210526013228.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607a79287173e---zuwujib.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdf6d3f147---45536950838.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/navakekonapavaxadezo.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/6208986788.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/zirivasen.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160927e5aa8d4b---pomitaloreduposomidi.pdfIn PDF document text
    • http://chapelguild.com/images/usr/61369040795.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/nt2897gqm9okicbmkgguk9r0m9/nolak.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/wenijexuxa.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/wifexesof.pdfIn PDF document text
    • http://charivne.info/images/file/ditasezanogatetonenisuti.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a92cb41743e7fbf0f2b55345b3d1daf1/jajivosizegijefaxotaturo.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/48329359757.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/0f6eebb98c9ef0522656d9d7a02cffb9/86373555739.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3dbcec6621---nubesesifo.pdfIn PDF document text
    • http://btfa.tw/upload/files/65755149725.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/11399803947.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/xatemesuzaramezaritulel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=psychopathology+foundations+for+a+contemporary+understanding+5th+editionPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/22445949c955603d025f7bc6ce7fcc0a/vibizibivoropor.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F26B 11416 bytes
SHA-256: b4cfa06f059867bff3a06b6a8fc7b35d540e477ba8df099a3ca46f5dd7c6f2d0
font_01_sfnt_off00020d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20D13 3660 bytes
SHA-256: fe94b61d9b18045a11c9a29e017a8ba2c56d785ba208bfd96e0b3325cad67cf7
font_02_sfnt_off00021b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21B80 18960 bytes
SHA-256: 36bd8fb113d2182676857ffe2afd04cb47d2a42132655e4006e61c71034c0182
font_03_sfnt_off00024dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24DBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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