Malicious PDF — malware analysis report

Static analysis result for SHA-256 8013012b9aa412bf…

MALICIOUS

PDF

101.2 KB Created: 2021-07-22 09:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9d16a1bf52102c7fcdf78fb73b1c8ca9 SHA-1: 2f4c78fc536c29b02716b104bbe798c8cbd211d4 SHA-256: 8013012b9aa412bf6e280a624ce934c629a895d8e99300ff3f9031578caf29d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/29degdcqc0h0a0nqdqta24sl5h/23453600208.pdf In PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/gagemexokefemejirugipujuz.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/zigexejuzuv.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09172dcb5a---75923065995.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607686417d0c0---jatugepivi.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b7576d7c6---wiselofajumiz.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/kigokozi.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/c81e5548050abe3057667dd91cf04607/20661086664.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c71feeb50a2---21107474859.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e612b28c2---62809824460.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/2f445e35513ab0f830380b0f247d8d42/21510888894.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be43992eb1a---4826231970.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/59482523869.pdfIn PDF document text
    • http://whewfamily.com/clients/12004/File/65289792282.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160706bcf916c7---37766783422.pdfIn PDF document text
    • http://www.polni.si/Images/files/15059032648.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6891f43daf---jojopejewidakuzovusipokow.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/gotugelumexuwirazi.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/025830403ed32d2111997537bf692342/lilumisokomuzivufupi.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/4726157509.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/oeafe8k4hkoqiposil5tfnd9dm/68119051400.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/fk8t0csh771or8rfimmur1doe3/50027584857.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c4d8e1a7728---81393863434.pdfIn PDF document text
    • https://airbays.com/userfiles/file/16482080162.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/mugitenarupaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=css+tricks+snippetsPDF 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_off000128e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000140f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F7 10164 bytes
SHA-256: a91682f108ee1f16e348342708c6ee91bcd8f56c60efb0c1562b2bd4ad575c93
font_02_sfnt_off000157d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157D6 17564 bytes
SHA-256: bc6bdf542668feee52260766b37c99b09969d97f5319039e140c4a5377d938ad