Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d2b54ccda191218…

MALICIOUS

PDF

80.5 KB Created: 2021-09-07 09:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 085dd264de631cfb46f01733d2180dd9 SHA-1: 77e3b47a47eb0a8bc1d4cc077ca0323a0054ddf9 SHA-256: 9d2b54ccda19121840b40abe196b9f63309dbdb74755adb287a94f276da20d07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ML classifiers as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised or disposable hosting, suggesting a phishing or credential harvesting campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure the malicious destination through link farms and potentially compromised legitimate sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=benefits+of+sustainability+reporting+pdf PDF link annotation
    • http://skolicka.eu/foto/images/file/6289634934.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/imsqatsln0ms80jio9gso202j3/98675344917.pdfIn PDF document text
    • http://centromp.it/userfiles/files/26710000409.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085a8f1352d9---bixetumibazutelogarujuv.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210802_025706.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/rewotalipovewinetowuvif.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/81057269134.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/aa5a2a3ec1234333cb248bf46678964d/33841544430.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/34421111720.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16104ed0fe8dd3---70343751549.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/68339193443.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160950f4e723ad---repakodakobiditedi.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/33925765508.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/lanezekezawug.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210718205040.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/8e19d7a30b79cab513bfe8e5b9607f4b/31961047708.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/81279490158.pdfIn PDF document text
    • http://cphs1970.net/clients/877309/File/lepinegof.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ff5dd499b---sapepufidi.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/aa5730522dae22a593948aa6b8d595c2/mubesu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/te6r3je04ucdq809n4nc7gru85/rozixekekupimizen.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/dejenojajitosizadon.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/54035084126.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_off0000d5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 17156 bytes
SHA-256: f5e613cff3caa633e57a23b47969246c238458c635b65e204054ada2d3a21fdd
font_02_sfnt_off00011a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5E 11080 bytes
SHA-256: ef7a235896684a61f6a257ac34e17c6d7c711bef8e03013c2a96bde9f5baacc3

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