Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b7e5fdbab1d403…

MALICIOUS

PDF

72.1 KB Created: 2021-09-02 08:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3ea0d72e2d29847e115b93bc1cad5a65 SHA-1: f89d98a743c7f047500e6c55caa67886b0c30207 SHA-256: d4b7e5fdbab1d4034bf06ddd3b509adbcf8540707cb59c21bebbfa0c8379261f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external sites. No scripts were extracted, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://progfin.pl/userfiles/file/binumilitavebepumov.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8035fe74d7---83473506113.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/j2n02vrffl44n46ek6e4c8nre6/pawexi.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/pugodukaguvapiteto.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/xobosofanikasamuda.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/duvarobirogi.pdfIn PDF document text
    • http://ciskmv.com/css/file/surigene.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ab44c988617---pomubokadomepulomiguta.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd437b02e4---gepodimizugekowopofaxiz.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109aa0696b45---98797650856.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/20713638949.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/9mc7b77i4vhvb5pkud7bp0s4ud/39722217203.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/jumamamiredepokutise.pdfIn PDF document text
    • https://jagominum.com/contents//files/65888248574.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/abb1552b05563993727d863f04ce07f0/34439314028.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/lolisejelamerukasoga.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/bo4ao7fip8q2v05iv8gitf8fbe/20922027301.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3071a7f97---nilok.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f342c1fd0f---fakamatipiv.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/b1e1a5ba0ab016f23b8cb7af74548f8d/gaxorogubezubexozexe.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/tekixan.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/d5e0a8d206b23012df3af079885678e4/musofedive.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0933083d72---64474557633.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b2439885198---zivazeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mangrove+swamps+meaningPDF 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_off0000b6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C9 10596 bytes
SHA-256: d0a1f534e0642133dee4f1615f36d71fc7e2f4d9bafbad19a7950127c0e1dd39
font_01_sfnt_off0000cf03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF03 16756 bytes
SHA-256: a6ac801b125aca9e81148f1cab201b9508e4b5d827738f2eae24425658c39653
font_02_sfnt_off0000f947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF947 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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