Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77d35cf319ea46a…

MALICIOUS

PDF

87.8 KB Created: 2021-06-27 16:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 563e31d53179b1558c56a430753c1257 SHA-1: 2500e6adb7b29aa0a65f9d438f4ffd219e8aabb7 SHA-256: c77d35cf319ea46af25bd10342f34b9b5a016480da4ee2770dbf9ec72caaf006
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and external URIs, suggesting it's designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=write+email+requesting+something
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/40095827ce5caa9a5829fbcadc2e7b19/27221362301.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aab41bd279b---dabasukawegafaza.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/rcbpmi5enh1dhcg402a76h2su7/34333439150.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/42a8e29f033c3af80d527b314e8c67dd/62833230015.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/c93720664f7e7e1240f91c1957113f12/nomudolovegajinokolijibi.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/52d6681523cf01fecdd3aee2df244b1b/vafejagutaxazuretudufu.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dfb59e695---1612602172.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d38f4fe3c35---74034504187.pdf
    • https://rumusjitu.com/contents//files/gopujerenevejokotizene.pdf
    • http://grossfamilyreunion.com/clients/0/00/00c8ca1d7e0432e0ca4c178cf0a97985/File/77101115588.pdf
    • http://ozanatalan.com/iboard/includes/userfiles/files/69478432010.pdf
    • http://jr-bang.com/uploadfiles/20210627035937.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/5d107ea0bd4c135c806ea4e4ff9cd441/35699454547.pdf
    • http://bright-mineral.com/uploadfile/file/2021052519192996.pdf
    • https://aduanaldelvalle.com/userfiles/file/gijezaluvazowebajuvok.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c96f75140ef---58960705036.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c236c1ae166---lunazutojasuja.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b76a87930---bimumovimasilobuv.pdf
    • http://cjatkinson.com/userimages/70689795256.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb94fbd8aa---xapisunokakok.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/74c5ff538f748f2b6a0e80f067f6ac12/wokibek.pdf
    • https://istocdukkan.com/userfiles/files/vedile.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb9ce07001---38029676060.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbf790e047---domigupiworagotog.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_off0000f3b6.bin
9f9d17232c8b71e98ebdec5bf30d03030988652dbe1951003d14b9923ee33cdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B6 10792 bytes
font_01_sfnt_off00010c12.bin
114adaf3dc8eb3c4edf761b4c5a630a2e0d208cdf80364075a34924994370dd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C12 16932 bytes
font_02_sfnt_off000137f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137F7 16792 bytes

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