Malicious PDF — malware analysis report

Static analysis result for SHA-256 67fcb6d56ef2fdef…

MALICIOUS

PDF

88.1 KB Created: 2021-06-26 09:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e3a0aabb993a753f488af288570fa63 SHA-1: 5a7fed82a76f311beac0e8b268bf9b1979ccfeb2 SHA-256: 67fcb6d56ef2fdef14ca460d87a218d0b40bfa2046ccda4f6d85f93470e75135
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. This pattern suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/56bcbec719c21b0e76c930b1a67af02c/gipoludele.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609400a992322---dafamaxubobegix.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/uh41k1iudu10lhq0vrq0vv53dg/dexegorinenakev.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/r5rs2ur27elbl6d22pfqk2h5nmu9tmp6/22676612948.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/0husq47ergqse0225jcqk6sij0/gawagi.pdf
    • http://bygreenpure.com/userfiles/file/vijarigesevolunezalapuxal.pdf
    • https://ihotel2b.com/upfiles/editor/files/fugexumomezofutigu.pdf
    • http://amandatravel.com/userfiles/file/legitiwejipolefudujemawi.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6146b1440---varuwavepisomug.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/85247988074.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc4ab6ea86---tabadi.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608032edc524c---13262553204.pdf
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/14875331066.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6abe033ffc---komapuzifidepuba.pdf
    • https://primer-spb.ru/files/files/34068243704.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2886cc4e7c6eedfcf5ac38fc0aea4e08/diketameforojasa.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54cad0b0e3---15525426966.pdf
    • https://bluza-shop.ru/content/File/ximanalisuxomigikifav.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fdc61ccb8---neruvoru.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0c8bf108e---bujutubawexuwifutipuziwek.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd9bf3b22e---kifeteram.pdf
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/togokosug.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077cb06b5010---daxedisufotutazuse.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ed24495d6---rimesorola.pdf
    • http://premsaktidal.in/userfiles/file/vonosilupavefirivovenigej.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=vaulted+church+areas+crossword+puzzle+clue
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f560.bin
b804d8e7b69f4f6328f3671b9c18b795a75c86333e940ee5db6e7973eef38e09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF560 10628 bytes
font_01_sfnt_off00010df2.bin
6477ca94c7f666caa447d6839ee5b5ab14760417f40703deaeee593e6ecba8e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF2 17204 bytes
font_02_sfnt_off00013ad3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD3 16792 bytes

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