Malicious PDF — malware analysis report

Static analysis result for SHA-256 feda52c456ee6324…

MALICIOUS

PDF

87.3 KB Created: 2021-07-07 23:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 236d8e0c48541cc4e7fb5cc127799f90 SHA-1: 0f67da64100c17576c094ab64a2ec5224e984417 SHA-256: feda52c456ee632403c489a830674efe006a671c1d1e41122dedc5807ec89e51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and a critical ClamAV detection. The presence of numerous embedded links pointing to compromised WordPress sites and other disposable hosting suggests a phishing or malware distribution campaign. The document body is heavily obfuscated and contains no readable text, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/96e259bcc1a03006d9c8d326235ccae4/jinujuzipipojufepibarafem.pdf
    • http://amtutoring.com/clients/865321/File/lemirijorezogizukixaborek.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082b6e96b140---givanazinalatafefupovof.pdf
    • http://elcampoeco.org/FCKeditor/file/bokupitejojajurifenug.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160704ac4140dd---wakumoperiperufasawisiga.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/3c4420eec7e2be2b8ad0f2c41462f0a1/37939166760.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a75456d7aee---24047927332.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/u5t0qll71tlobgek40ka37sr82/899479210.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/k81jacrssnkqq7h1tvptam6iln/48050909541.pdf
    • https://arte-salon.ru/upload_picture/womulomapesojinetak.pdf
    • https://west-holding.com/userfiles/file/zipezulemivur.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/7ab5ac7dead0393cc7990acd6996b7c2/kusumemijevosisemogepofan.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2713438111---32492774183.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/pesonejofeje.pdf
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/19821207622.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/d11f47a670e4e16218844a10f9b1cccb/20276161240.pdf
    • http://deltools.com/userfiles/file/xeritem.pdf
    • https://associazionedynamica.it/uploads/file/33645323918.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/d607185a781fdb29f8f3963eec0a2e15/lokomenizixurumonara.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/5a859ae4da602016298d4cf4cbf0b70c/65063710338.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=abc+model+of+cognitive+behavioral+therapy
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1be.bin
ec3a0769341ab237462174ff68969503404f289584d2a2066d5bb91590bc56f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BE 11200 bytes
font_01_sfnt_off00010b5f.bin
3f488a80f73682eae9bae70085382876fb0c3fff8d75ed8d9da2bbc040bbc6d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5F 16968 bytes
font_02_sfnt_off000137bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137BC 16792 bytes