Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd99dcac88adbf5…

MALICIOUS

PDF

72.2 KB Created: 2021-09-05 20:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d24cab8c6f2b31dcca6a855c7c8d75ed SHA-1: aa60289ba12942641d8ff2a882a917b90df25490 SHA-256: 0cd99dcac88adbf5cb7999aadfe396fde98bcdc34df391245611008c38600167
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=genetic+mutation+worksheet+middle+school PDF link annotation
    • https://sambelteri.com/contents//files/gobubokibewuwevukiwutido.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2fc0db641---jumefobipos.pdfIn PDF document text
    • http://klinok-saintp.ru/files/37917758034.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/c62bd4581a923e6cb5ae50d28e7fd107/72904746357.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/40973050667.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077cab2bb4bb---giwotapiri.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/pixifipap.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/fixuradojiru.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1db8b880e---dapovaw.pdfIn PDF document text
    • http://thedreams.cz/files/85651451097.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/joziwunibimatekokaw.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/wopot.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/vrjb0mn5kruj2t6bllsueec58c/39769164648.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/vikepimifetatojun.pdfIn PDF document text
    • https://ultralloy.net/upload/files/funedojaruxujegitogiz.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/e18bf0f63be0ae3f8549685c691c1b6e/wumosuw.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/6b410bcb59308ba970b47364e7408ffc/pebib.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c177c6268---93521918851.pdfIn PDF document text
    • http://www.depomatrial.com/file/50084904243.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adc2c4774a---31835716191.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/2e484d8ab7a7b1233852a8ddc8070746/gobagiva.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76961383037.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/fukajabapebono.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-8-31/20210831202711545841.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///padasol.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC1 15288 bytes
SHA-256: a22648db62a4a81385970a1dfc632dc3bfe9a88e2c71d4b995b937058bbf2c54
font_01_sfnt_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 10952 bytes
SHA-256: a2be62bcfd306b722e1da589e65a57f75e4bd73b06f242cc0b5973b9d308a505
font_02_sfnt_off0000faa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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