Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18b8764504ac8c6…

MALICIOUS

PDF

88.6 KB Created: 2021-08-09 12:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fef598e3b725d181825d08799436916b SHA-1: 2d9ca981039098f817bbe86c02ad8b2cea89c2a0 SHA-256: f18b8764504ac8c6477b0fafebb41c1ebe4d3a2ca4cdb6444428bda7c6263d37
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting. The presence of a 'download' button lure and the ML classifier's high confidence score, combined with ClamAV detection, strongly suggest a phishing or malware distribution attempt. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pamat.ro/UserFiles/file/62885847981.pdf In PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc0f289bd9---51501428517.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/pobubedomusotimojiwo.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210723063820.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/funalikigojot.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160d2200e4e4fd---40889806574.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/16949697153.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-28/20210528024854335019.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/11d40ec3032a4d80e7560f3ce2903b4c/20011890991.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/18464515492.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/9bcd1937bd1f7ecb95b5bf6b031117dd/tusuxabup.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/mewonepaxinevuwar.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/3893077589.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/b0jb09gba5pc6r6vbfcuk03bdc/venisevesapipijurin.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/nukixamepufavumajusoxulil.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/57215840262.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf103cbaee---raripoxezetonowalasodot.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/gipukepezijevibamexito.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210713_201933_3103.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/1902b45580741288dad5216d9f0a5206/17570359835.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/waromapajutudamogufuno.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/97275783050.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1ed963cf56---mogebizir.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/525b38657316af2309a3341f6aa29761/jakidorofufizaparuda.pdfIn PDF document text
    • http://zaiger.ru/img/file/zaporasokegav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=bushmaster+xm15-e2s+bfi+serial+number+lookupPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1E 17128 bytes
SHA-256: f010d36a4fa304d1142b15f03820655c911d39ee77fdca416fbb8efc66af9eb6
font_02_sfnt_off00013979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13979 11452 bytes
SHA-256: 066a4c5d62ae2391c9f4523b23cd1d630e2d4ec558d5c0d4364f5e1ff1a2c36a

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