Malicious PDF — malware analysis report

Static analysis result for SHA-256 8499c0d637b272e6…

MALICIOUS

PDF

95.4 KB Created: 2021-06-25 22:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 7fe055d4112843898a614086652e4e76 SHA-1: a90215fba5287d4b2f8f8f2522f2d166ad5ef65f SHA-256: 8499c0d637b272e65c237a68bb9b7abe3e4455d8fe82d8a886b4e5e433d250b5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting the PDF acts as a lure to redirect users to potentially malicious sites. The presence of these links and the overall detection profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://inwebjor.ru/uplcv?utm_term=social+problems+in+education+pdf PDF link annotation
    • https://luminex.pl/upload/file/dosubipuzuzaxudegavoli.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/73074126371.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/441e87ae784719c101c7f7af73bb8080/rozinuwejavususonemifesa.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/rejudebobonizaped.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/3f1e414e1951664e01b4b53271ccc1da/pafilepugejabudozajufux.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/bd02752ec8fbdc45b5a18832cadabaab/votutozutodod.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/lopukewesitif.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160805d3cf1e4b---17002758464.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/98024ba6dda6a339625f4b2b6133346a/wokuxame.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eddc8468f---famukezubobujavumume.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3aead842c---76630763191.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/ganebumaz.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/roxinitidufesarod.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3633cf476---4952766320.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/66181985450.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077650cdabd6---nojulevema.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/150841034213.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/hghtdq81bnb4f6gratnuiuql94/pasegegotoja.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712371b1fc3---26037919750.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/13689279004.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/32676ff52d65d680f65f6182663ba89f/3771563350.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160806d50d6f6c---31551418627.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/mejozaj.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607638fee2adf---tagivod.pdfIn PDF document text
    • 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_off0000f5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE0 18540 bytes
SHA-256: 22a0f01ab420dca5ed7e0d416f60cf7fcefe974f02f9c68c811f1c7ea2b12275
font_02_sfnt_off00013ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA8 11096 bytes
SHA-256: 5e2cade76b043186831f047ae385a6a35248d74ec8af9aae2ba8ad7cad685078
font_03_sfnt_off00015841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15841 16264 bytes
SHA-256: 5f3495e86a71f7a5ebe9ec0d61c830f6645aea3d960774f63de8f2069d1122df

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