Malicious PDF — malware analysis report

Static analysis result for SHA-256 acdef678c9e8c94e…

MALICIOUS

PDF

95.6 KB Created: 2021-09-05 22:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6a90547b958256e5f441a4cd54ee167b SHA-1: fb8268b856e985c9431c14e60e1288dded80cee0 SHA-256: acdef678c9e8c94efb14d5ecaad03eea027fc6f48153c96cd1d05710a13c645b
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, with numerous URLs pointing to potentially compromised websites and disposable hosting, suggesting an attempt to direct users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters indicate a coordinated effort for traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://lesfeesdelhetre.fr/upload/files/xufuxewesobujanu.pdf In PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mptd5fdju2e1unk55rffs849t4/90791189033.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d3d2755f5---jonipovikexutajigisanela.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/20780883d5bdc5d8dd42b27c2146d819/xonozus.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1611b0dd1c9feb---31868594277.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075826bec8ab---mezonomoselulog.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/f359e705bfe324c2d7a8d22eda467632/13002081872.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebe2246099---61595477235.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c968756531b---81320795657.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/43837376700.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5e63a69f0---xowewikaranev.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/sowuxevopar.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210719122216625.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/28588871804.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/44591727552.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/10611224736.pdfIn PDF document text
    • https://questyme.com/userfiles/file/21391977993.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/7a91499bb0ad7dd4a67df8d96057b126/17902063721.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210622013442340.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ue7cqcvdf8sp5a7p4dmd4otikc/xesubipegeruxabowaru.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/88202232240.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/pukijaketifilowaruvawo.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/laxusodadoriji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=biofeedback+therapy+for+anxiety+pdfPDF 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_off000111b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C6 17484 bytes
SHA-256: 8c8d32f423f56739e2845d3e94524a5da9b4595fbd884e7c7716cf543049777a
font_02_sfnt_off0001576a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1576A 11004 bytes
SHA-256: ac2b74f9f1c0875907ddeaf0255fb2e92947517c925768dd44fc6421ec4761ab

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