Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eb2a8bfcc6d343e…

MALICIOUS

PDF

82.8 KB Created: 2021-09-12 17:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cac2afa777b5196ea4aa50c5cc4e1380 SHA-1: 2e0591781c8bb2022ea2089e90a3823ba3b052dc SHA-256: 6eb2a8bfcc6d343e381155c7bb5531e00f0d7abf77a82ebb387de4b742d1e32c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS uploads or disposable domains. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://akademibt.com/resimler/files/24766785176.pdf In PDF document text
    • https://elnativocoffee.com/silver/upload/files/27885189942.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/76296034055.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/93767443036.pdfIn PDF document text
    • http://hasyo.net/files/file/renibebonifivojiz.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dae424f43c---79347961128.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/jasoxanak.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/73308667463.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/88tl8h8gien7rg0v86s1trh731/32939655259.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/45770579023.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/40191992410.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/xisolinaxokapufa.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/55850514915.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/73517397521.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/28872030880.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613dab5629a8d---92516269177.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/sopeveguzufamiluwufaga.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/kutojumufedawute.pdfIn PDF document text
    • https://iwistw.com/upload/files/fotibapemupopunimoripo.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613155db26018---50822049702.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613909b340074---51914647554.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/fomidetirebibetabug.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/95973269787.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/54e59cc4b69accf4f6dcd92a2a224b9f/42793623511.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/67400469394.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/6372463959.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/51236405347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=watch+the+thin+red+line+online+free+megavideoPDF 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_off0000dce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE0 10816 bytes
SHA-256: c68c7c6440088c74a407335518c7b55b0fd313d80173ca47740835dda451dc98
font_01_sfnt_off0000f56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 18844 bytes
SHA-256: bb89f8f55e9c80254def5487f85d3780345b50d16aa27ea53f8fda4bb903ae41
font_02_sfnt_off00012558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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