Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c6d41482800bf6…

MALICIOUS

PDF

95.6 KB Created: 2021-06-27 22:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c235dc6198fb85fbf3132181046141c4 SHA-1: 8764c392f3f331a13a8ff14613d6bbdd794c6fab SHA-256: b1c6d41482800bf66378e61cf2a26a505fefb40126cd513b0acd10c12e02d3da
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some hosted on compromised WordPress installations. This suggests the document is likely used for phishing or to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

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://queure.ru/uplcv?utm_term=toeic+training+reading+comprehension+860+pdf
    • http://minerva-collection.net/files/files/7478995667.pdf
    • https://mfdesign.hu/files/file/pokawinotumipejid.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/39a998edae4f80e95e2eb1afa73b86ac/46220287469.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089c60c2067e---kixuse.pdf
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/ba5c299ee8d40e491a20021e5482b498/61300003459.pdf
    • http://araonline.hu/uploads/file/32453388827.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a073cc4d352---murivudokegelu.pdf
    • https://simondaulte.com/ckfinder/userfiles/files/jelaxegiwupilaz.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2f19093f9---52115436589.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c92509214---77800666876.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3cs3moetf3r34prln8gvtmmk14/38558324604.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/57f6cc134443055c42d1c66aed85a84a/medefisagulusewewapo.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b7fb75c7---karurosozamesijovanu.pdf
    • http://chi-kara.net/userfiles/file/70702968049.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/4aeeac96788663b322e98d4b12c3e0b0/31635479099.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5dde1b66a---17225536596.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/7dbf80b39902926aa3afccfbe5d6fc27/81428545120.pdf
    • http://hasici-pristroje-eshop.cz/files/file/23404630260.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160779555be982---87553089069.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/4382f02spka13ehhsfdrooka5n/mulewudizavod.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b08d93207c0---vimixevav.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5f72bd195---kadadolezafepufuvalulax.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608da5be889d6---pukowipedodekezubufusek.pdf
    • http://chalappuram.com/userfiles/file/gifozeb.pdf
    • http://agnieszkapawlik.com/userfiles/file/luxedokuzinopozad.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d7c74483d---97645972608.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9d2.bin
1953e6a666631d84c2a5443bcd8ebba6f844f8c78341260b09b5256e89908b70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D2 11480 bytes
font_01_sfnt_off0001048e.bin
0eb6ae3870233555a8bd40619491c53795f5da0b37ac0fb314be1256a78d3c90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1048E 31500 bytes
font_02_sfnt_off000140f1.bin
4e8a04f4a78fa3afc58a57d2cac5c2e1f8bf6776ecd71fe0ca93f3ac5299143c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140F1 16084 bytes
font_03_sfnt_off00015621.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15621 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.