Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bdd403d719de4aa…

MALICIOUS

PDF

72.6 KB Created: 2021-10-03 03:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01c8d69370f45b5a184ce4a25ce24f5f SHA-1: 3e5f6239edae74ddf051b906fe9d4fd6234b4bc0 SHA-256: 1bdd403d719de4aa79f32843d7732b39f40fa4b2d14f25244a46f43d6d6db72b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://perfectprojects.ro/userfiles/file/78673794160.pdf In PDF document text
    • https://matfplayer.com/calisma2/files/uploads/59381781304.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/tifiposufi.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/5ps66dh1at4hil8gm4kkneo0vv/fubaxigebizapefojase.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/jefaz.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f3569a0b57edc9f4c1e15de729599c7a/menemejokasulitulunimubab.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146380460b3e---pobanagozunagejosinu.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109260058299591.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210914162511.pdfIn PDF document text
    • http://airfa.it/userfiles/file/fubelonav.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/39094283088.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/fowiz.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/wuleraxetasovozapigixuj.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/jixofafinilaxobutewepaw.pdfIn PDF document text
    • http://attilacenter.org/userfiles/file/61654825822.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/94624044372.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/36084627596.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/72672605632.pdfIn PDF document text
    • https://expomediainc.com/upload/file/vigesalu.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/vezobiduw.pdfIn PDF document text
    • https://aleemanschools.org/userfiles/file/6933442011.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/63529488306.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/21221183607.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/57748817773.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d042260a00---10060030259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=double+vanishing+point+perspectivePDF 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_off0000b4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CE 17424 bytes
SHA-256: 0ed1d0fb2c258d3646dbb6a53cbe41bcff2571ec9b5461e1e6f78ad185bf0419
font_01_sfnt_off0000e187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99E 10960 bytes
SHA-256: 2e63c77a2bc3e827360b3609cb3246cb0618ad475b5256db6da634dc0c701ead