Malicious PDF — malware analysis report

Static analysis result for SHA-256 0586babb25e0e9be…

MALICIOUS

PDF

90.9 KB Created: 2021-08-14 09:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 210fa7e6407a20f248eeee4f8bf44efd SHA-1: 119d3cad0e99056dc7245de8d54d39c6717331a8 SHA-256: 0586babb25e0e9be47ffd5eb47077f650917048cf4eb41dc3d413b4cc8fc24a7
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to redirect users to malicious sites. The presence of numerous external URIs and the 'link farm' heuristic indicate a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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 http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c73ae20185---41491781375.pdf In PDF document text
    • https://condicionamentofisico.com/arquivos/file/54992938411.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/37128100133.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/kokuxijigusazo.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/308cbc07db82e1ac6ec02045a7275532/78436130838.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a20e401a3---56038369030.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/8649012204.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/i5j07hesdhaukqbo0tfitgb6q5/nuruva.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b01dcb7d4e---letupuxotusutizipofiruko.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/17565618786.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f38ab0d2f71---70047019273.pdfIn PDF document text
    • https://kede.org/userfiles/file/54329906272.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///kobijanisapojebipixi.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/kuxoruwofebanijejosenenu.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/83819464295.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075a51690523---rovapisitu.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/28742409126.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07e55b2772---74618886809.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/41898088077.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/84292217945.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0b2bbd79---sesaxubowupetudoxelaz.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/26774846842.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/badisojare.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/41757257590.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/94201353969.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/68797097906.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/segexakoxonolukababo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=atomic+structure+crossword+puzzle+answer+sheetPDF 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_off0000fe6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6F 17344 bytes
SHA-256: 345ce98cf755bee7857e47020a24c000873c782cf57790fb18b5ef23c629e13c
font_01_sfnt_off00012bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC4 11008 bytes
SHA-256: be1afd9f8d8ead8bb9ada0b541b7187c607f748f0d4ce6aa9617f34cd469de3b
font_02_sfnt_off0001453e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1453E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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