Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb7a27d3638ec2b…

MALICIOUS

PDF

80.8 KB Created: 2021-09-01 03:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 049994d94c3983c7ba9851b7574e3259 SHA-1: 840080efc452089d2787560f33a7570ebe9b4875 SHA-256: cfb7a27d3638ec2b042d1880c8d38bcff16c6e05a76b14f6ae6d4d6c7d3d0d39
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/tq6u7hc51okkecnhtclp25ceqs/zegira.pdf In PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608358b2468f9---retadiku.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/f83e3d37dd330467dffbf660bb7c6035/wekojopusofilebaximib.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/47861220314.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28644b5d07---vitojakasubazaguleli.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/supelevonunirerixukusiz.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16100fc97990e2---73593522334.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0ngp86bihjua5kkk8uvrk6dm31/70640126736.pdfIn PDF document text
    • http://rilta.net/userfiles/files/fofuxidi.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16103966adac3a---memezix.pdfIn PDF document text
    • http://epmachine.ru/d/files/rikewozon.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/37109158307.pdfIn PDF document text
    • http://stroi-sistema.ru/img/7965271003.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b5f7b1d4fc96dd63a5b0b72c26bfe3cd/59314070095.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/mumadotaradap.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/mafusisimidokawuf.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/63516573055.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/dewatezinizawadux.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/10268894649.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/24703764608.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/a9930cbbe3c93f6096289bd69cb98e4d/47390815337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=not+everyone+should+go+to+collegePDF 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

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_off0000d8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 10652 bytes
SHA-256: 00e4b4acd796f9fc6a50179d7bfd9725cfdf43e248eca67ade0942db23c90701
font_02_sfnt_off00010938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10938 17280 bytes
SHA-256: 6f28bec41f33f33e4a67465a069d6ce101ef4e47bca3e74c0c05b5cb3a228625

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