Malicious PDF — malware analysis report

Static analysis result for SHA-256 af08bb7f970ab45a…

MALICIOUS

PDF

84.9 KB Created: 2021-09-23 14:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2c72da3566f14f18342e50f5cdb8327e SHA-1: 33d6b2b38b8cb93b714c2cf8fa877388a1fb2dae SHA-256: af08bb7f970ab45a616ef6fd56555c483b0079b9e414ebeab72b99ed979afeb1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded JavaScript suggests it may be used to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=minecraft+hack+slash+mine PDF link annotation
    • https://pottoka.info/files/galeria/files/47758824011.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/xomilij.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44611727183.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/34414363043.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/9835180021.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/46113426952.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/gomupuno.pdfIn PDF document text
    • http://oris-am.com/editor_up/67428043649.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/zovefajureruwozewagukovi.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613efd1db8b17---99824584555.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/lopesapola.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/dinazaliwozopa.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/29098488793.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/45133122887.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6ed2e0741---6697752193.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/12155784304.pdfIn PDF document text
    • http://isvpro.com/custom/files/11808465076.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/27759774432.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/venapenedolejelunon.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/zegenagopasaxeli.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/fatofe.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/58276053276.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8jao6umqh3dc328r6bshc2rk00/86160567940.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/46258989149.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/kusupaw.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/33267753983.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_off0000e7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 17688 bytes
SHA-256: 172291b7764af8d37a7352456a455a677f6214e0f140468194ae0b0be8f72f6e
font_01_sfnt_off000115d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEF 10568 bytes
SHA-256: 91b4162087ab069c478599cff5498e48c33292c1467a0519ff372ef59ce110f7