Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93e7db704d5bc6e…

MALICIOUS

PDF

75.8 KB Created: 2021-09-02 20:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b93bab95d9a5c19ac26b73f690fb8442 SHA-1: ad5400980ea4a5855abd780c51df6ee2d1c9f945 SHA-256: d93e7db704d5bc6ed7a4a8103f453b437ece2a6357672a089f03d91f8dcb6781
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm pointing to compromised or disposable hosting. The embedded URLs, such as 'https://irlanc.ru/uplcv?utm_term=pdf+joiner+and+compressor', are likely used to redirect users to phishing or malware download sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://irlanc.ru/uplcv?utm_term=pdf+joiner+and+compressor PDF link annotation
    • http://tortsurprise.ru/upload/redactor/files/98205127368.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/73064819539.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0297f9a5b6---tugepaxamujenulofojulewub.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/32168149178.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/75438737032.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/dirumizaselasototenunovip.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/kafategewimesirevajop.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/92999936464.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1h7q5jkh02kupm41a51i1pvmmi/tazijikemekewevevajeriw.pdfIn PDF document text
    • http://berrybucs1973.com/clients/3/3a/3a2d6910be1067feaf6dc79f90d505e0/File/gimafites.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/30663123707.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/cbaec0b817558cadc0dab7118b8ce397/wetabumobap.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/lonadunef.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/79793277640.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/timedomotugolumu.pdfIn PDF document text
    • http://iphysiology.ru/upload/wonesanotegusefujo.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/winetojarawusakexan.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a3d653ab5---jinazanezewitul.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/daveki.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/kodiwibote.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16083d00397596---30262430787.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/55444664488.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/44883769298.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/e60c570a810fce0815d03abd45b5f9c2/wilutagatewutiribenomoli.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/tegelabexolutukuwefara.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/rukikepol.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_off0000c478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8F 10768 bytes
SHA-256: 7d4369e8b7dcf35e6abff2c8a0da3b46a58dd5ab9111edb4e90a0593c09a77de
font_02_sfnt_off0000f53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53D 17148 bytes
SHA-256: 35656de2c199a6f9c2af7a34656b1261fa711f361f9ef4833efe1ffc0b48b735

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