Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba5f977fed10c96…

MALICIOUS

PDF

81.2 KB Created: 2021-07-06 02:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 03d05e3171ded9e1ea603ec4609a3be0 SHA-1: 66ab5057f50f457b2350e625b4f38e85205d78f5 SHA-256: 5ba5f977fed10c96af5544fe8c5ce20e76e02fcb962f7026a867cb8844c6431d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. Heuristics indicate a high likelihood of malicious intent, with ClamAV specifically identifying it as a 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged the PDF. The primary function appears to be directing users to potentially malicious content through these compromised links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a03d0b454---534198352.pdf In PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/q3jcnuh5m6k82km74bp7u8l7t4/27162418530.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/cb1b5d38c901367c932113a04916e14a/joxulubifevixunu.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/72285420853.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16095bd3506aca---bulodupakubutim.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/dukidowanunapodapi.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/9602b304079386bedcd998ce7fac8803/surafenitipidum.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608931ed91148---74338893327.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b9a388e9d---13155208778.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071f52d4f6a8---varexatisexa.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb79be0980---50404180102.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16077fd0ebb198---dulufolavikazofamafibafiz.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/31210765175.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/80731080954.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/faxibogijepilirodom.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd26d8feba---24136120589.pdfIn PDF document text
    • https://cubic.is/userfiles/file/28624050898.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/20784391924.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8060b6d17---wagoreweviwukovez.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/28254477448.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/59406518472.pdfIn PDF document text
    • http://fitviewer.biz/files/file/54158456366.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8bd2d65eecac968236aca77c5cdaace6/13532925938.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/doviteravujur.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210608044151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=hairy+muscle+nudePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC092 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A4 16436 bytes
SHA-256: dc18f50dfe6b07f583570edf188b89b93cedf855ece17c9d9bc8b072426814a9
font_02_sfnt_off0001039c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039C 10516 bytes
SHA-256: 472ede866777e56bc4199ed03a53ad13a878feafd2164b557f580cb93cc9568b
font_03_sfnt_off00011b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B74 18004 bytes
SHA-256: 03792567d10ff3ce529d7e2e3ec92cfb0078f62d9069d83ab45426bc0c00fc6b

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