Malicious PDF — malware analysis report

Static analysis result for SHA-256 7258835305ef933a…

MALICIOUS

PDF

75.1 KB Created: 2021-10-14 01:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4ab01c17fa5811b4cd621acc6b01da6a SHA-1: 690831258016947be118ee9c1b415447f89e3cd4 SHA-256: 7258835305ef933ad06634b99c363fea03da43ef6575038991053484c91c0a8a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution attempt. The presence of embedded JavaScript, though not directly executed by the PDF viewer, is a common technique for obfuscation or further exploitation within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea4e8d0b19---figebovowi.pdf In PDF document text
    • http://giustizianuova.it/userfiles/file/vipodoxowoxagaxetamoseja.pdfIn PDF document text
    • http://rsentco.com/upload/file/robapovidut.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/tilovafufopivomoti.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/70247633337.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/nogedaset.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/35679744697.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426b830b4f3---65493144190.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/25381949245.pdfIn PDF document text
    • http://africareview.in/userfiles/file/22295104564.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/falonobagepezefo.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/36116875309.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615c7500f0a7f---jewiniwewuke.pdfIn PDF document text
    • https://arteziano.ru/ckfinder/userfiles/files/93571265199.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/50499045005.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210901210939.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/xaligudovadun.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c8c1eea078---jezor.pdfIn PDF document text
    • https://mots.alaxarxa.cat/cmsimple/images/file/ribiba.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/tovupaguloxar.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/zonavonepesaliri.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/94451463457.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/sowonubikifebigadeduko.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/78339111802.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/TSvcnjQ06Jg/uplcv?utm_term=the+fog+came+on+little+cat+feetPDF 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_off0000bf3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3D 17732 bytes
SHA-256: 2b91dc8053ff9cdc4bbd7a65d10b87be05f462b4cc2d51f181f8dc2d6f860d68
font_01_sfnt_off0000ed07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 10476 bytes
SHA-256: ac2e97f5ec7c923b54ce6b95cbe8de6d45f5f2ea3beab89455684100118dfb44
font_02_sfnt_off000104a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1