Malicious PDF — malware analysis report

Static analysis result for SHA-256 850297b49f9b1b8b…

MALICIOUS

PDF

69.0 KB Created: 2021-09-12 22:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 47e70d565d6ba05b0d5182374ce55488 SHA-1: 3517b408fa052853f7d6ad378876f9c5e537f04b SHA-256: 850297b49f9b1b8becaf3158ee9c25b3d9676c0457fa527a3aeadd6d212e7ed4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a single image and minimal text, typical of a screenshot designed to trick users into clicking an embedded link. The links predominantly point to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users to phishing pages. No scripts were extracted, but the presence of numerous external links indicates a phishing campaign.

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://yournew.site/wp-content/plugins/super-forms/uploads/php/files/86dh4mftapf26lo4ckhv77vvth/jivadugikozenuguwegud.pdf In PDF document text
    • http://antonioruizabogados.es/userfiles/file/webexotemikanot.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/mutumudazakafu.pdfIn PDF document text
    • https://menu2uplus.com/images/file/85964120752.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/7899776207.pdfIn PDF document text
    • https://wittnebel.dk/file/3564576801.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/vuzebamadiximumalunofaboz.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/mepekudefiwukiled.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/34165351026.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/falegutajikavove.pdfIn PDF document text
    • http://altera.ukrstroyka.com/content/xuploadimages/file/84479936361.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/mapinimufubuwatefiz.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/580639e8352fdbd949820a1a696c3576/wutizev.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139a901430ff---59876707188.pdfIn PDF document text
    • http://budka39.ru/files/susopixozezetupanikug.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/10748878538.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/denewikawisawovokijak.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/bamug.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ncul3983pcl1mtv4i7k23stg32/87963106515.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/pimuxiruju.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/43038180228.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/xonulek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=territory+war+2+unblockedPDF 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_off0000b1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CA 14252 bytes
SHA-256: 97a0dbb4edf830e7b12fa252b508877d7bb87c23ee1bc8dc230b35957421fc70
font_01_sfnt_off0000d500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD500 10808 bytes
SHA-256: 68c42fac443475621a7d8b41b35fe5f6d8204cad0851058996811d8799247872
font_02_sfnt_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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