Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f2f258fb9cd9a9…

MALICIOUS

PDF

74.6 KB Created: 2021-09-05 07:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b73a431444d6918bff7318fba60a6aa6 SHA-1: 8232880321d24473216298ddab65233c2e245d7c SHA-256: a1f2f258fb9cd9a90dbfb29cff2eda027a85cdedd6fa32472ff4f122df802be2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous external URIs and link farms pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=dietetics+book+pdf+download PDF link annotation
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/ac83650ef47d67d6d86934b02e30bf55/90818969259.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608365758d0f0---30669282625.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae092396958---11784493196.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4adde0a22---mukixawolubadikomifewatin.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/78161995670.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764fc6bccd8---temuzazese.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c6e1cc180---tabega.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0d634a06772385b2c72a8865198b0b60/sigukubidiso.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/loxusireni.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03b1b83612---litejikoreposegiviz.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/58990020673.pdfIn PDF document text
    • http://unityproductions.com/upload/files/6809852582.pdfIn PDF document text
    • http://2440027.ru/upload/file/nuxipagiserajiridupomemaz.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/fabuwafilevebuwef.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/lodapevojoviserefejus.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/zapavanosowajuwivesusade.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/riguxasisufuwo.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/eb1304a6d491bbb0ceb95ff549a7a297/kewinelogofonip.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160871eaa79d45---rejiroj.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/7lf6bpso0d9d7hh5lqqkp4ru95/5405404321.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/155a23dc116ec05e01c9952697e26a92/54105707694.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160afe4b177f39---96579845576.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/baxalelolumepa.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/fesesexomipojewiribof.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_off0000c178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC178 16452 bytes
SHA-256: 548328f7acd1555ee131cbeb98383fff529dc4e9f1e498497892153b8ff0096b
font_01_sfnt_off0000ebe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FE 10832 bytes
SHA-256: f2bce11ea204b875dc69cc85d140a7390c4dc68d25e204364bb4250956ac20fa

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