Malicious PDF — malware analysis report

Static analysis result for SHA-256 b777d26580fd102c…

MALICIOUS

PDF

83.7 KB Created: 2021-06-28 07:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: fba73df440aa06f3ea4a74c31f2673c7 SHA-1: a9fb53c823ceda4a5a8f65096ba727d679da135a SHA-256: b777d26580fd102c195e223a3010f7acecc26609157e0dad31c44df524cf4087
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised websites, likely serving as a distribution mechanism for phishing or malware. The presence of multiple links to compromised CMS upload storage and disposable hosting further supports this assessment.

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://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9be3c5d74---65546108881.pdf In PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d82e87301---49464804973.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/05a073dd3deacba8dbe05f4ffbf1b632/91012095057.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/cb108296083d4ef5d215f6ae5cdf7778/godegamijuvuxulinix.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/4f434fe8feb230cdcd75c06251c01208/6538495821.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/nuroxilokonizo.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/kitapesoluku.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/98352810673.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a49b6cb4c9f8f55c1e62e29c34e7f2fe/nemaginupidoza.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/bikalapujufupitarijidovev.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/817764e058fc76bddf84e645ec873baa/26224123139.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/f67fe16e051c0b6e26f95e4372447072/tadodanab.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/42164119966.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/86415439435.pdfIn PDF document text
    • https://coil.hk/upload/files/25240757505.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/1lph5mhhtdjd80the5md0o3vip/21342293189.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a781b723b25---xovulex.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beec566f510---8683441930.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/nidawor.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/purozijimijosabosoxulaken.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=quick+oxtail+soupPDF 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_off0000e44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44B 17404 bytes
SHA-256: 3eece4eb0783a3a0eb31d655dcfe90ce6320eca7fca82f9f9dc6d49ae8d92e28
font_01_sfnt_off00011224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3B 10384 bytes
SHA-256: e6d1790b3306041ae22cd0af1b0f565c2ecb1d21e917a9caea8feba19bea2b29

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