Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce82762dc3bfc11a…

MALICIOUS

PDF

73.6 KB Created: 2021-09-13 11:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f38d8ee8e0d9d2a485bc8d8253aff7f SHA-1: f4fcaff94d7709a02069db8a7189c5102681d394 SHA-256: ce82762dc3bfc11ad1f9a2a418980b1d0e7ea5cdb983c5a06f6b994aec0035c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple disposable hosting domains, indicating an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://fonnepal.org/userfiles/file/35630146841.pdf In PDF document text
    • http://almawred-sy.com/files/adminfiles/files/beweba.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/92415679473.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/toribamumek.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/gasizawaresi.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/rogiriramigajiwoje.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/fajabodudufenawusojapoxa.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/56817432375.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/danubetoz.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/1554606826.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210905_048F42674F094A6E.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613858eb634eb---60497604294.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/ranalox.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/puwiduvopasenaruwirotefe.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/5rl8678h4i4lrb9fld6a3n2von/46961156983.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/975d71332ff7e922f14e243809a9b277/48843846775.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/duzumupigogirevojezob.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/43232243500.pdfIn PDF document text
    • https://network-italia.it/file/56885698307.pdfIn PDF document text
    • http://skncn.com/u/files/85996499732.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/58808459653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=my+hero+academia+movie+eng+subPDF 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_off0000b72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72F 11084 bytes
SHA-256: f1eff472e2782344c4b76b7e221c75ca39d65282bdadd7b304127a126e8b7c0f
font_01_sfnt_off0000d0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A7 18556 bytes
SHA-256: 3ef790b4d83c237812b4ccffda15aadbaebaeef2ecfd9c3b7b3cf7081d38d235
font_02_sfnt_off000100ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1