Malicious PDF — malware analysis report

Static analysis result for SHA-256 985fa8c87faade13…

MALICIOUS

PDF

70.4 KB Created: 2021-09-21 23:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4f4fb797caa9f08cd846ade6c2042483 SHA-1: 8c780fc599e8c7f2f42d29e81240f62ce0848a93 SHA-256: 985fa8c87faade131c3e064b648ac39fecf3c743c745a5e1d89bcaca6c2b37cb
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of these links strongly indicate 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://krisoc.ru/uplcv?utm_term=trade+in+the+zone+pdf PDF link annotation
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/wuwonivob.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/3c8d834a61a245f3c7daaca214e5da95/32055650326.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c203bee31f---jelasexokitilub.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/64301745494.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/balitiferitolim.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/3054427695.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/55112742158.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///63154303897.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/sadumibikojeju.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/3222902996.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/33943316481.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/tusezomuxaxa.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091214145357.pdfIn PDF document text
    • https://temahr.hr/files/titiwijopawadu.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/namowoxuferid.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/zabuwolanabinizo.pdfIn PDF document text
    • http://juha.be/_files/file/sixixumu.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/sibemunebemu.pdfIn PDF document text
    • http://guitarenko.fr/img/files/jetebubedo.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/83477906947.pdfIn PDF document text
    • http://berbun.com/user_img/file/65124964601.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/16432687505.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/26905139151.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/22119854622.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132392e2112e---2145582044.pdfIn PDF document text
    • 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_off0000b641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB641 10404 bytes
SHA-256: 0652efeb6ea4489a22ff3fa0230090abe534887938a6e04327fd043a7f6bc74f
font_01_sfnt_off0000cdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB2 15060 bytes
SHA-256: d94711b7f1aa86bbaf16cf1e528a1b6812415192b1837af35c10930ee567ca57
font_02_sfnt_off0000f456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF456 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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