Malicious PDF — malware analysis report

Static analysis result for SHA-256 de29fc1e0ca9cc73…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 09:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: b24930b9a23e5b8982d3b269ef86ffc5 SHA-1: 5d6e577e1f7021abf126536d97c70fbf84bd81fd SHA-256: de29fc1e0ca9cc73094e39d16bfeb9b2b36ba537ac8fc38c2a07a2fee3aed11d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. Multiple heuristics indicate it's a link farm hosted on potentially compromised or disposable domains, designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 70 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://satbietthu.com/luutru/files/70660118051.pdf In PDF document text
    • http://simonide.org/userfiles/file/bojosap.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/55695404495.pdfIn PDF document text
    • http://halaljones.com/uploads/files/likesa.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/33687357686.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/50778824224.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/23402a864be98e18f7c1da96dbcb3a5f/26848237475.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/junem.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/rujixuz.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/bokivalobulamuzamago.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/bokokudekefelogumujixedu.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6ccdb151b---xuvipalinutize.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97986413583.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/wakajupinagimori.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/fowajapikunalawugaxazozur.pdfIn PDF document text
    • https://scalping.ir/data/files/file/sumajojavezajosib.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f458ae498e---42547902293.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/13363735755.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/54617781580.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/594289457.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/zoboz.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133263e098ee---986869625.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/xagafirikinubovoraven.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146759eac3a0---suzofe.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427742319ea---mukopawikutugidevugixon.pdfIn PDF document text
    • http://boldogelet.hu/media/2813491819.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/69066795178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+emulator+for+3dsPDF 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_off0000b76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76C 10768 bytes
SHA-256: e74b9fc1010e8d64354ae71dd7aff42efe85214a8ae7bd8a89737a791c791d89
font_01_sfnt_off0000d046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE858 14268 bytes
SHA-256: 7a951734c97d712abf68e526c7413bfd43025e14932ea3fda4a3b89e5c3daefa

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