Malicious PDF — malware analysis report

Static analysis result for SHA-256 6973226e292e67c6…

MALICIOUS

PDF

77.4 KB Created: 2021-09-19 16:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 379fc2b437bdb479de65c616600b753f SHA-1: 0dcb89c78cde97db736186fcdd654b08c4d92205 SHA-256: 6973226e292e67c6bdd6f6b992e83c633b16789b852c0131ddcf7eb0323407e2
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links, some pointing to compromised CMS upload directories, suggesting an attempt to deliver a second-stage payload. The presence of a visual download button further supports a lure-based attack. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=beholder+2+full+apk PDF link annotation
    • http://www.peritaonline.es/ckfinder/userfiles/files/65904497445.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/pavatijexirilu.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/xezotidoleragor.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/68456557419.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/xepum.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/92898910995.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/dokudos.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/86025064711.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/11325736590.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/9e2c1bfd211143940a27736bb5475447/26519053056.pdfIn PDF document text
    • http://jfe.hk/userfiles/pixuwulufuvixarapepovom.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/benubevel.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/14289313818.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/4733a0f72c49cc96358647d6931023f2/5520530036.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/47198164886.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/65961545314.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/19071365269.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/94071702081.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/vamukixajanefilamixa.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/12576825338.pdfIn PDF document text
    • https://x-software.cz/data/file/18824727798.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c0c682d36---99401790399.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_off0000ca26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE238 17312 bytes
SHA-256: 2d22224c20e476ecfb29c6bf49c3596aa73d329f5a30f7a174cc130479723d24
font_02_sfnt_off00010edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDC 10496 bytes
SHA-256: de2da433a06d4a4edb850a2239165a85b4c18f0ebf23b4fbe7917d68a8723658

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