Malicious PDF — malware analysis report

Static analysis result for SHA-256 f373784006543b03…

MALICIOUS

PDF

69.2 KB Created: 2021-09-12 18:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f4cec580d42c859e276068dc09489693 SHA-1: 44e8904dc6ba3a98ab561c85e2267028181d7a51 SHA-256: f373784006543b03a1c283d3886f4fcec2c85965f7cca4696f321da31a76d795
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous external URIs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be a screenshot, a common technique to bypass content analysis and trick users into interacting with embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 69 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://allytemp.ru/uplcv?utm_term=minecraft+bedrock+enchant+ids PDF link annotation
    • https://profitaler.com/UserFiles/file/47348367340.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddc110307c---99334950676.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/tasawixawuxenif.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/47715073037.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/38b19836f6c35d211b08ae21cc9d4f83/pakenanulegelobo.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/genodiwowitebidukilujik.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c72aec000---69151274787.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/44699031771.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/dosugugibejisubufin.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/35769693863.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/73721018714.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/80711024734.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/12483470708.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/gatifirazigiwowipof.pdfIn PDF document text
    • http://cartopack.be/Images/file/puwanowotodufuzilup.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/pavixesazivewowiwimuvokom.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/73391714749.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/75219053398.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/35239259809.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/belogamo.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/36724955115.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/5339202600.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/ramokab.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/safez.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_off0000b387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB387 13996 bytes
SHA-256: 051bf7b9dd3ed729023ee601711a75a2218fe6a98205e6ef681ac2d24cf827ff
font_01_sfnt_off0000d5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F5 10752 bytes
SHA-256: 70a63aebd0d31b832b1c6c103e0e66da2113854c0b14322ecc45824fa70a4dbb
font_02_sfnt_off0000eea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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