Malicious PDF — malware analysis report

Static analysis result for SHA-256 f29b7151740fb771…

MALICIOUS

PDF

107.5 KB Created: 2021-09-06 21:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b76cbeed6e9dbf6866759c1c748fbe4c SHA-1: a8d097cb8bfb3107b79c410dcbe620c8771c89f5 SHA-256: f29b7151740fb77173acef4b3f4f001028df3f99c014686b13a2c768554d1841
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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://alatheir.com/atheirwsfiles/file/91553463273.pdf In PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/93480277893.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/99241032914.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/23950177627.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/panejimigadojifalij.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/35206471213.pdfIn PDF document text
    • http://tai-group.com/upload/files/kimoseb.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/27842525009.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/3829411517.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f5b2df41aa042b747ea029d1d83bee4f/16775121155.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/notosuzeserarelib.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/92526442567.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/52870616685.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/4dce78bb4676e477f281885a74b53bde/forejiwevobimijuve.pdfIn PDF document text
    • https://fratellifurloni.it/file/48630197610.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/60304430780.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/sivuvi.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/rubolidom.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/7798813605.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/56130223993.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/b29c5f56b4686ff1ecbe9b20f311d577/89291802923.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/48043220380.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/83708177693.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106e7da38ac5---vejuj.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/99466171570.pdfIn PDF document text
    • https://0924055971.com/uploads//files/202108041116245858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=corrientes+filosoficas+de+la+investigacion+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001399e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399E 10892 bytes
SHA-256: 7eac1550b6d4a08b080bd3b8867e33ee9bf7d0cd653aa114ae012d26a5bcea33
font_01_sfnt_off000152cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AE1 20480 bytes
SHA-256: 9672ce07ffde2d8d02e89322571a383fd081c560bca34d1c51968393ac4aaaa4