Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c08cbccbc63ef0a…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 06:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 39415412bbcc68a442bb90e27111067d SHA-1: 043d2ecb430d18a47a19576c89bb957f0207dc8d SHA-256: 5c08cbccbc63ef0ae209c180de89a0bc916b9659054cc763b5f2034586ec6ba9
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. It contains numerous external URIs and link farms pointing to potentially compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://wastran.ru/uplcv?utm_term=sistema+reproductor+femenino+pdf+fisiologia PDF link annotation
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/7e42fff3e1ce35128b3e05225642391b/53272032425.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/aa869db74b17a024201de36c00a910c1/60946978792.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af2ec9ad9e4---69277533951.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc494befbb8---vovijesijeralatenazibod.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/17242628237.pdfIn PDF document text
    • https://fishuntpesca.it/file/62657690347.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee775ec660---52300554458.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607a95fa000c3---fikofopenupariwu.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6144b86d06---91469640641.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ebc846b5d---29949594054.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c492ccc708f---xexitudanawefunep.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/4775038268.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/95187478484.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3381294a34---2579086235.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/69237190187.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/buviv.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/db7c9352f971aee1b919b0c18cec7598/wilojun.pdfIn PDF document text
    • http://aimic.com/userfiles/file/losulilamidumag.pdfIn PDF document text
    • http://grabnerestriche.at/xeposiraretana.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/rilositalikerope.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/98394533791.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/ritizawovozix.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_off0000dbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB4 11136 bytes
SHA-256: 1f9dc1d485f5e03bc03ee2766fd84a4bcfa45e8662de1e8ff82d79258e376be4
font_01_sfnt_off0000f57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8C 19340 bytes
SHA-256: 3ab06263f13c1539d06bee4fd5fa51544eadc1cb80f7b7f14948205e68252615

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