Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9eafb87aff528a…

MALICIOUS

PDF

88.3 KB Created: 2021-09-07 02:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f4e22c564013b41ef77476d139ca8e65 SHA-1: 79f94a30d84b66817d2eaa516f449e590d278e06 SHA-256: 4f9eafb87aff528a8e4484f5ee01044f94c8f1ec5c36fadecf268e47569b0b0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs and link farms pointing to various domains, suggesting an attempt to redirect users to potentially malicious content. The presence of compromised CMS upload links further indicates a pattern of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=the+slap+christos+tsiolkas+pdf PDF link annotation
    • http://peterpan1996.it/userfiles/files/gemekunojupitodosapuna.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/16134179906.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/35624144232.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/45647723594.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/modupizodasewapafowuliji.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/nn1rptsgsjh4aiv62nk5l38fkb/tomonajowulepuvojove.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/32ccb756adb2d7955381e2bc013de7ed/lanugolojavi.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/xowuzanorusamelo.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/4648277158.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/k8rsjm1vnvuqkrs4pc0lnlsfr2/xewisexobonolafosugukobi.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/megapa.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/munodijowudokanatumavase.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/kokiwakek.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/fijutomobexalomodip.pdfIn PDF document text
    • https://daiichigroup.net/uploads/news_file/4553226062.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/90685510740.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/41629767117.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/89075612908.pdfIn PDF document text
    • http://talleresjpg.es/img/file/guxoliruvorazesijurek.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63530e6125c845b65b9298089f93e97b/60371821060.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/29177623238.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/7063514025.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/97138118256.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_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDF 10668 bytes
SHA-256: ec8fdd452d75dd16def3eabc59d5d730a1529a4d11cb7217293199f87faf7246
font_02_sfnt_off00012475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12475 17884 bytes
SHA-256: 37aeb6db1ffe1cd5480e2c84ed391b951e5a857bb44491429ee59b91cd84097b