Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df56deb6b8213c1…

MALICIOUS

PDF

81.1 KB Created: 2021-08-27 20:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 773ae25b8d384187478fbd40145eabaf SHA-1: c323234cf1ddb37020b92b201c244e5194e5bcff SHA-256: 6df56deb6b8213c141efe02b6a1ff72ba8d01b55968f335b582923418fe948e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The embedded URLs, such as 'https://irlanc.ru/uplcv?utm_term=activate+windows+8.1+kms', suggest a lure to trick users into downloading further malware. The presence of numerous links to compromised WordPress sites indicates a broad phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=activate+windows+8.1+kms PDF link annotation
    • http://presssimayeshahr.ir/pic/file/853180314.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6261d4cc9---xifige.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609279b0c6ab9---bawutuzijapi.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/52834227021.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ee09b483d---26872212606.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/bi9teaph3esc0ir9klomodvfj2/10190168237.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/uzavirir.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/3mjem3njg53of6fupssr1qmj5n/makujosifelex.pdfIn PDF document text
    • https://ka-base.no/images_content/file/27404022518.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077a4b9aab25---84870645298.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/d5ae1584c6a5ff790d87bfd6ef44cdd5/6418946539.pdfIn PDF document text
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/tepupoloziboja.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/53253891485.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/480530647.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba69e36d80---66645572055.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/68359539319.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090aa28c627f---dixejev.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/52407385395.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/2c09d86519cbe72495df97a7e3d66dfc/sorife.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f6747d7274b33bb2227b8bd00d85764f/wopotejonazisolelo.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160714b44cb959---26506152946.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_off0000d65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65C 18472 bytes
SHA-256: 64730d278fc8cc20665906109b573c7a05932eca7d28a2ce2e1adff3ccc6d520
font_01_sfnt_off000105aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC1 10936 bytes
SHA-256: b6f1d43f844cce5f91016cc11ca4c0d0ade29e9c1f9c3145edbda518ec35fc5f

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