Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a22c1557134796…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 13:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: af7839c9ac1e5ad3564a203a7767eb0a SHA-1: e543ee8a205d79acdf5ae7407e1ce901ccd7e665 SHA-256: d7a22c1557134796709eca059a431231ea4d5877114e217675a72acef95edc2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://catamma.ru/uplcv?utm_term=harry+potter+philosopher%27s+stone+full+movie+123 PDF link annotation
    • https://sunsetlearningcenter.com/userfiles/file/miniga.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161461d10bb0e7---80567682032.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/9075892567.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/78806397298.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/lupofewikomivogexuga.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/78105801072.pdfIn PDF document text
    • http://www.vako.vn/app/webroot/uploads/files/ziropowuwifezejanixe.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/godosawunaxer.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/24613716940.pdfIn PDF document text
    • http://unseretochter.com/images/file/32648619948.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/sosimujufiwupazelijuzomir.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/xajegaf.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/dezowolotofanasa.pdfIn PDF document text
    • http://landpas.pl/upload/file/kogibuzizebugune.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ba2229233308ca086db9ded8cdcff2d2/37987105108.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/gibufewigamofujolozogodu.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/86911733784.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/27245615314.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/sfrmcc8pnicf28qklj0g236vqv/lixulusifademonesamo.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/kuxaponek.pdfIn PDF document text
    • http://www.toptehnik.si/images/40600001366.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/rewoxofejevok.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/foxavuk.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_off0000b0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C7 15272 bytes
SHA-256: 57d3169cae201fbcfaecf31f35fab103fdecb3c8c0f2a86ed824f1cde650780c
font_01_sfnt_off0000d76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76C 11272 bytes
SHA-256: 7eb19350b938eb9a491492b37c5ea13c3a80faffa2907fd95e55c2ea6873ca75
font_02_sfnt_off0000f1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1