Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c30df030577ed92…

MALICIOUS

PDF

89.8 KB Created: 2021-09-11 06:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 62d22f105aa46784529a0781e8d021d8 SHA-1: 768f01743b55f3bd901f4f8832fcc44d5cb33379 SHA-256: 0c30df030577ed92c076f154fc97ebeca4034b1910630a4cd369416af4d7366d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations or disposable domains. The embedded URLs suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smidgel.ru/uplcv?utm_term=tom+and+jerry+the+nutcracker+tale PDF link annotation
    • http://e68momo.com/shopadmin/upload/files/23799875273.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/76920972784.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/13243203456.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/nudatomikuvu.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bd8e4d6bd---5270966960.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/dutojafadenakakezer.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/fidifimogoj.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/63407606850.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/nubufiwolupazu.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210908165944_dd5rae.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/36717240251.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/didavejifarugibemi.pdfIn PDF document text
    • http://vln.nl/files/file/gozedoweboxotowekis.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/30840864307.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/756488925.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/46421876365.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/fikubapofawar.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/pidag.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b338911fa6---xurovifu.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/xiwaponeboxi.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/wefavopewajonarakak.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/kowesadopajakape.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613864093ba4d---fasarozetaxuliwevi.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/wezebexoxawa.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/likaritemomopabudelofizik.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_off0000f8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DE 18336 bytes
SHA-256: b86bd08e3a73f4e975048913c4ff0781609335c64019e1b6f0fc0101b4652a39
font_02_sfnt_off000140e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E1 10776 bytes
SHA-256: 937b9879733302c0486946e55b77f972171367c5e367fa65810791fa43aa010b