Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c3e5f69e08b780…

MALICIOUS

PDF

83.0 KB Created: 2021-08-15 23:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1141d51e1efbece764f64d480d85ed7b SHA-1: adaff8a89b30a288c8014d5ba600ca70f41a128f SHA-256: 62c3e5f69e08b78083ab586640fb25aea3455f4fc1300fea8bf0d697168e1db3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://chcial.ru/uplcv?utm_term=medical+fitness+certificate+after+leave PDF link annotation
    • http://zdravi-kromeriz.cz/files/file/73831899555.pdfIn PDF document text
    • http://drironcat.com/images/file/58590012032.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/65204912520.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16080ddf3d6d8c---23839905866.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/38068553002.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/64914424328.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/75ff07575bb4165448105bb3e4b0041c/basinarelufufodiditevomad.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739db1838c0---51901858100.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/589db8e5481e839f00aa51c03f6a1766/84915232345.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2c88dc2b9---mewip.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/xubapumufaxavizekapil.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/9676562196.pdfIn PDF document text
    • http://timebymtm.com/upload/files/bebotelidapiv.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/xikibej.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/jisugorixezuxakosika.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/44124642745.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/fututizidinaru.pdfIn PDF document text
    • http://novichiha.ru/pic/file/25298278177.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/xeburabufevez.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce11732dd1---girep.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a662f51faff---86794921113.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/belasofisojowibeluzepo.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/jewakej.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/0a4ef28cc2d8b94f64c7b0ed2f739f0d/jesedasunivulop.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_off0000e248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 16156 bytes
SHA-256: de18e43a3d103a446019eadf8d857f6fcc3d622471815f34bb18dfffa62cd05d
font_02_sfnt_off0001241d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241D 10408 bytes
SHA-256: f5178f8e69092814d5c4a2bb015978f81511398b1a52e6f76e2b36dd5a7d84c8

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