Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71764073deeaf03…

MALICIOUS

PDF

129.8 KB Created: 2021-06-29 19:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45a9527bc2e829ff1f9d834acd3d0eae SHA-1: affca3cd80827544ca077b78ef6d379399e022fd SHA-256: c71764073deeaf036834ea03654c327f2db80ce16a3a2ef87a15d570da1b70e7
196 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and heuristics indicate it is an advance-fee scam lure. The document body, though heavily obfuscated, combined with the numerous external URLs, suggests a phishing attempt to trick users into believing they have won a prize or are eligible for funds, likely requiring an upfront payment. The presence of multiple links to compromised CMS upload storage further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://ketchas.ru/uplcv?utm_term=cours+of+english
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/cbcb8d6ae61ee735c0cf8a72645091bb/kabemaxo.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9e17aed7d---wifutib.pdf
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/5d5f75c86ad56f07c614aa575a5c0e59/90577465505.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4699cdf69---24458701024.pdf
    • https://angkorphotographyguide.com/userfiles/file/30934461458.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ebae9d2d2---dibitalowetotajuw.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/378a8giv5l90e87faertufq2n3/17470970120.pdf
    • http://stellamaris.cz/userfiles/weginiximazalunuvojibix.pdf
    • http://www.tobywells.org/media/fckdir/file/difozejexowu.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/us0qpjnt7orunukdt2n24p4kh3/vererijetewo.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a055bcc244c---35651249745.pdf
    • https://ebal.ro/app/webroot/files/userfiles/files/3571758321.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607391ed79dbe---26617154108.pdf
    • http://amsasecretariat.fr/userfiles/file/katurajexezukede.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/kqm9lplmn2vuq1qt7vn0rf7rkn/29608815716.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608827efb7bf6---bowug.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/0d5c484c26fad835486dd11fadb6e44d/kejabotajixexalepidoz.pdf
    • https://communeouchamps.fr/userfiles/file/wokim.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c44f2fd9c---70714601237.pdf
    • http://mictrogiang.com/userfiles/files/37060801529.pdf
    • https://metricgroup.it/uploads/file/45793155593.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210629230752.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075360cc4f52---tisewefogimijimezofepafe.pdf
    • 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_off00019961.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19961 16792 bytes
font_01_sfnt_off0001b173.bin
9fcdc596ccb31c5ab347c79ecbb3d0521719b038e268e7e0dfbcc796bc0baf7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B173 18364 bytes
font_02_sfnt_off0001e11a.bin
f964bb3270fddb2dc6363a617ce70404c1a6d6baf3fa7ce090607fbfcb8101e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E11A 10364 bytes

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