Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c77e3c92b85317c…

MALICIOUS

PDF

84.9 KB Created: 2021-07-13 02:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5125eb2fd51b5e8731a4d332722f9b30 SHA-1: 527c683f862c3af3ae8e844ece35bc9fcb6efe2f SHA-256: 5c77e3c92b85317c7ba23322f63c858bf54e031b8db3de339859374a722cce01
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating an attempt to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095e9a91743d---86122816321.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/d873b34975022428d61369f1cd565603/41136220153.pdf
    • https://webtechnocrats.com/upload/file/gezetavelorijivom.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bb12a52ad---zobus.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/vuvomogsk10436amop4a9sinii/80963875261.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8039035f16---zebubufututojafitakafudox.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f84044af4---34247094453.pdf
    • https://colakcivi.com/userfiles/file/18189492208.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a790d2bb1a6---minasifaxobu.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ac9a11a0b---xujadijebamitojavivunad.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3825ad57e9---33636973680.pdf
    • https://keongracun.org/contents//files/86819191086.pdf
    • http://luingpyrex.cz/foto/Image/file/dezep.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804fecd26be---22879965412.pdf
    • http://bbfrontedelmare.com/userfiles/files/womigasudemidafa.pdf
    • http://hattingtoemrerogsnedker.dk/userfiles/file/zelenojuletidapag.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9c2deae6---dowidi.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/049401fd6be7b035b99a6a0d9c13bc88/25172439852.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f7b61e3fe9e7ab2579a6a5342c4f85b6/rekuvupurigewifezazepo.pdf
    • http://goksirkrupskimlyn.pl/img/upload/files/gulijiromilox.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=strawberry+wine+meaning
    • 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_off0000e7cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CF 16792 bytes
font_01_sfnt_off0000ffe6.bin
9c4a96f2f59c087e643c966e37a26431759bfe0acddb79318d967a3d3bfac2e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE6 10532 bytes
font_02_sfnt_off000117f5.bin
6febc57d0b24b195a5895713db4afb19d2be852ab27b76710ede7eea371243f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F5 17932 bytes