Malicious PDF — malware analysis report

Static analysis result for SHA-256 57cbc264cbccfc4b…

MALICIOUS

PDF

85.6 KB Created: 2021-07-05 19:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a23ca382daeda4dc6a94232d058782ba SHA-1: 2adc89eb9d2197d15776b5e5e5554861c8f1dcee SHA-256: 57cbc264cbccfc4b2364d7894af93399ade4a87c4e8be4945084ab5e7ff9970e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains phishing or trojan content. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the PDF structure strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://pngroup.pl/ckfinder/userfiles/files/80541189221.pdf
    • http://alemotta.com/resources/original/file/58848986607.pdf
    • http://gianniarnaudo.com/userfiles/files/27316424010.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afcf8da9784---10277842832.pdf
    • http://amirafouad.com/uploaded_files/file/domilonobenomux.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/f4a0ea88234604a009c16f9388490648/rafofone.pdf
    • http://k-yoga.org/file_upload/spaw_upload/file/20210507124309.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ece571f77---fanitipivekusofopi.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dabc7d8843---pogotifolenuvenizawak.pdf
    • http://phutungtdc.com/upload/files/13181191954.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/v6n8g8ib13cmgj4j8amr3v23bb/49594678478.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3fd077e4b---72841878968.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/1l36fg9sira21s2ldeieeqgr27/juvevokumuwadukafumetol.pdf
    • http://thepnguyentran.vn/media/ftp/file/64331396299.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb39c8b4dd---42827812081.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966523ab7a4---xidekixubuf.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608b274a66732---dezox.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e023a7a306c---81686719763.pdf
    • http://jrpst.pl/userfiles/file/dodikavoruju.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096809290729---gateg.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/81d2796cdba77717da0b818989fed357/32803093686.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099f8cae3d3d---sewafa.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/842dfd91c7a03840f209be6d8b84639d/zedigevowenatadul.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7d8bb64b3---kesixumirinakefifefuzu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=small+rivers+to+fish+near+me
    • 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_off0000eb9b.bin
616773bcd79bbbd5a9ea85041cd44e58bffd1c1612db59e7d973f291e11b87e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 10620 bytes
font_01_sfnt_off000103b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103B1 16792 bytes
font_02_sfnt_off00011bc3.bin
082e9f5870c617f19a6b84de2dc57aad49c61320a376fdf3b1470df2fe516c6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 16936 bytes