Malicious PDF — malware analysis report

Static analysis result for SHA-256 78beaf5067b24218…

MALICIOUS

PDF

74.6 KB Created: 2021-09-14 18:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 80c25c550d8b5d04f98a0975c0dc792a SHA-1: 690a880778b01a2331955b2c42f26b464d2744a8 SHA-256: 78beaf5067b24218ee9c2f2d0e82ac046e3b0598a236449fb2a0fa7ea498488f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including ML classification and ClamAV detection. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=best+free+games+for+android+tv PDF link annotation
    • https://igk-lilienthal.de/downloads/91787367322.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/36899494633.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/78662301300.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/kigokova.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/rapizapexedezevefozi.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/butojozefox.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/84331964011.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/namowaxufujewokotawodipu.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2c16af3fa---vasema.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/0bokd4oh6eqtace2udm5vqpbak/47995089531.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161364c4bea5f0---6399183835.pdfIn PDF document text
    • http://jonme.net/ckupload/files/fogomamewikefubafelipop.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/33773101482.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/lopajakebavage.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/refolif.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/22157558997.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/vadajewudepifesozux.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/fawufepogezufobisudusapod.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/pagafake.pdfIn PDF document text
    • http://apicn.net/upload/files/27174739824.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/49168160624.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/73678945541.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/jisiwuzaxewagofakokeje.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/16690778768.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/61241230981.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_off0000c224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC224 10772 bytes
SHA-256: 17175b70dcc19a6257e2fdaeb0b5439c88e047caad9876654a6f52f9be9fdbe0
font_01_sfnt_off0000dacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 16520 bytes
SHA-256: a1365de5ef99a7ff448db17e9cb94766df52db7180f6aea3a72613fb1a6a83b1