Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ed8feebaae4ae2…

MALICIOUS

PDF

62.6 KB Created: 2021-06-22 12:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e994f621a0132c5f30896df0cbd4fd1a SHA-1: 06d9b68f6ab435dd094079d0d53d425daf241061 SHA-256: 28ed8feebaae4ae2947398f3874b21f9f05d84d34029973a77f2f585e7b642e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of external URIs and link farms indicates a likely spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cructi.ru/uplcv?utm_term=pokemon+soul+rom
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/tt29q24iakl7vk2da8hg6bb1t7/53033655950.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/5d6a74194286666f17c5d96051bf3463/2050742710.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b16f08d4323---fijobifulot.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/j0t8rpnecbqrms9p4mbuq9e2m7/83275868904.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/4224eppe1p204ro4gu91ptagh3/zusupenemivafarotel.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608042e2dc7c5---zakakawamab.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/0d486f89fc92532ed162e237925f46d6/mubijovatozatoreso.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21e93ba445---82983180234.pdf
    • https://tese.in/ckfinder/userfiles/files/2462612341.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f74256e1871d25c34a7f34d2b8cc74ad/rifovarovevupitorib.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d0237dafe54---panemibaseteboze.pdf
    • http://hzbmsj.net/images/upload/File/56424433080.pdf
    • http://alarcon-v.com/editor_upload_image/file/94559616489.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a94371624ebfab58848dc1c990934528/wubomatafiboru.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/38sjrj0vkjasljgq19p6rksoon/pasigarimenodulijavixaxaf.pdf
    • http://sahrugs.com/userfiles/file/lepixasanitejutasezogeri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9d6.bin
1e7fec3a7decfcde25d9ccf860ad4e2990c50e8516e7d059352478047588a52b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D6 4684 bytes
font_01_sfnt_off0000c9b2.bin
f4f0f4d015a2ad5b7ecea2a4fc1111fe91356ecd470f3d255f9371d50a079f50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B2 10588 bytes

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