Malicious PDF — malware analysis report

Static analysis result for SHA-256 0411284c9b06ce01…

MALICIOUS

PDF

83.0 KB Created: 2021-08-24 01:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4c5d4df7f3aa0997bd0e77eb91407a9f SHA-1: 54426fdb957a4d1e8236b069658c355e65b55ecd SHA-256: 0411284c9b06ce01e29dc68f1939db46a2ed11c802854051f4de69d732852d67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs indicates an attempt to direct users away from the document, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://laborke.ru/uplcv?utm_term=staph+in+urine+causes PDF link annotation
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a90b13df5---9948251334.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f40f5c4393---mokaxepamonexafavewalokax.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/suzilamobawixeboturowi.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210623214812.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210730_7F7CD51338A7260D.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/492efed4f629f48db962d1a4b219523e/10001355003.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/35339694283.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c154a62e7ae---kaxovilagexefuwidov.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/savisa.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/dabarezunofeb.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/62369403450.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b81aaeadef3---29424072670.pdfIn PDF document text
    • https://bor-diing.com/upload/files/63849792890.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/bajixuwupubazaze.pdfIn PDF document text
    • https://motacademy.it/file/wumaxi.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/a8639236f98fbcdafacaa72d52441c3c/91824487160.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021742052116360.pdfIn PDF document text
    • http://schokobrunnen.com/idata/wotenodemizafevix.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/dajaritoli.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/60095155820.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/a9dd09ku3sjdt2vv7brjjnd3q4/bujisudusutozudilap.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/doruxoket.pdfIn PDF document text
    • http://josquin-capella.de/download/momomozununowinum.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_off0000e565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE565 10480 bytes
SHA-256: e34affc51258110473c6505c73daaeeb561c9695dbccf748d2022a873f955b51
font_01_sfnt_off0000fd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1E 15820 bytes
SHA-256: b6f8047f01164a486924274e79fa83790dcbcdf9d1e5c872c67f018f1ca0239c
font_02_sfnt_off000125be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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