Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e1a93b8da14759…

MALICIOUS

PDF

93.9 KB Created: 2021-07-05 03:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 985df55fe2775009491beda79a34156b SHA-1: 42de3f1720c6499f3babf6d509b391457cc57046 SHA-256: c3e1a93b8da14759e78688cd4cc501957d8595fc433b7c147697ca110d297f66
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites that host further PDF files, suggesting a multi-stage attack. The primary purpose appears to be directing users to these compromised sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/binavqbrl7ahokv2jrl40qanki/patabunek.pdf
    • http://otvorene-srdce.sk/userfiles/file/68292186002.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e30695161---sigerafisejita.pdf
    • http://aftckwt.com/uploads/file/9899403389.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a706794c756---zeronapifuv.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608901c511272---94908981181.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a64b7206083---29028262039.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16079d74617382---33893179115.pdf
    • http://berallebags.com/UploadFiles/FCKeditor/20210521014926.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/telotabi.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/5706d4cdff420796bcc1442e4daba3fc/12601061434.pdf
    • http://luingpyrex.cz/foto/Image/file/53688853109.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c538bbc028c---35251528380.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b998f291e9d---86140215351.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/9f44c2359de2cd38c1f2731d00c4b74d/zafinumutirim.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f420b50f1---lenelozatup.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081d9f00926a---39575119847.pdf
    • http://unityproductions.com/upload/files/11088489548.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/j1d5iccut1p0qog8uaef5a1362/xufewabawimojilirumen.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/57e7429140e6344ed43bb0bf799c9d3a/tinixutikijotivexejufe.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bae1be4a9---zepotufeputofe.pdf
    • https://ludifrance.fr/userfiles/file/85244117437.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/61287650413.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/320014a10dfd859e64899d75baa8b085/ribiwifotixukenerefabediw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=lego+star+wars+extras+codes
    • 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_off00010f47.bin
3a09057f0f8351ab54af86f2ad0c53169935d976b0ad03acd2cf39fa91b7cf47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F47 10448 bytes
font_01_sfnt_off00012709.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12709 16792 bytes
font_02_sfnt_off00013f1b.bin
19999054a593daaad16498edef4062e5e135649c3eb6eb8cf00ab279d041a14e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1B 16652 bytes

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