Malicious PDF — malware analysis report

Static analysis result for SHA-256 a075b667fbb0539e…

MALICIOUS

PDF

78.3 KB Created: 2021-09-25 05:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 243feb87f8058cf632269d7074052c8b SHA-1: e8fd5d07b69ca9a554841b5d2728b2cf812464ad SHA-256: a075b667fbb0539e00f5425219882490af14601147fa140db3d0558f0a2d7d49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to external sites, some hosted on compromised WordPress installations. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious content or phishing pages, potentially as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://coomargroup.com/ckfinder/userfiles/files/rarironiruzaxefuxowedad.pdf In PDF document text
    • http://goldenagegroup.vip/userfiles/file/20152982122.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/09209e028f0bd84ffb9ddbb49fdb155c/93763844262.pdfIn PDF document text
    • https://uudanbury.life/files/file/52316103925.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/31279793211.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/41365515750.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613f92a1b5b32.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161445323cc39b---kajeferudipoxosewux.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/40963479661.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/22064054299.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2408aea6a---47355078150.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614231e9733dc---11087061893.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fd76e982f---72220871793.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/78956901015.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/lakodazuziwagozagidef.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/49079186916.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/sijetukokaxoxud.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/dowelemewovonej.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/4618078950.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/70705448849.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/titibufufidud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=stickman+warrior+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB459 16188 bytes
SHA-256: 800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34
font_01_sfnt_off0000ca10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA10 10444 bytes
SHA-256: 3d569cf5b76e31010567382a4b90f8b4ca6f63c7f315d8d36baa1d61f747c6a9
font_02_sfnt_off0000e1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CE 19300 bytes
SHA-256: 4eefc82ecf8e5d7bd71930558663f14f279561a94699ee8c4e37a2f04b231f22
font_03_sfnt_off00011341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11341 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.