Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15c04b36acb7c64…

MALICIOUS

PDF

82.3 KB Created: 2021-08-19 15:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cbf4bba0d6175e41be53157af87caba3 SHA-1: 13dadb6a1177a997991b2d6b67b8038ac9c58be7 SHA-256: b15c04b36acb7c64ee5bcfb60cb92a8773cc33094af00414ee603edf6c51c88e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the detection suggests it's likely part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/o5vo0ki52lb1622mbgvlci27ma/65375088632.pdf In PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/334bpl9kcf2a4pt481km2t1n8b/dinumofa.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210730034459551.pdfIn PDF document text
    • https://activepymes.com/pub/file/zukerigame.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083b9f004f0e---62437919275.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089e4ce57dfa---xojumererete.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/vabiwoba.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4174aa3046---sisuroxozunobexuf.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff83330a70---takosodibinijusobej.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/bedutekekodagupajez.pdfIn PDF document text
    • https://medius.sk/userfiles/file/rivanebolejele.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099b81b1fb43---45703008285.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/57441643167.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/87799578508.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/18184629132.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/vinabubewoxome.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db4c1f37c8a---zikavuzitevemezevuzi.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/vepozovunizamegatax.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/fopakovotixovitotogux.pdfIn PDF document text
    • http://it-hair.com/userfiles/40995344689.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/bolimenivosasanigagujur.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/migepepegaxila.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/83637573428.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/52833059573.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/senofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=allgemeine+summenformel+der+alkoholePDF 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_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 10876 bytes
SHA-256: 6407fa45c617394f6d727ab456bea66065ae10d90c9f71ef68f47d0518f6ab82
font_02_sfnt_off00010e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E11 17696 bytes
SHA-256: 9bfea47aec823989f9cf4cc99338353a79a59c29da532e0151cbeae4044a4452

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