Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd24980617088147…

MALICIOUS

PDF

92.2 KB Created: 2021-09-18 23:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6f8bf8adcd1a35f2a284a496eb5f8054 SHA-1: 7745ed7d543fab7475d3a1bbc1d5acba90daeb40 SHA-256: fd2498061708814743ac91c8cd8428ceda5a238df78e4d2cf580e5d79ea0b4ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such PDFs to redirect users, likely for phishing or malware delivery. No scripts were extracted, but the presence of many external links suggests a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://huntic.ru/uplcv?utm_term=fast+7+full+movie+online PDF link annotation
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/juwoweditulomipokafamogab.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/lejupi.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/xixawoxokonurotoleki.pdfIn PDF document text
    • https://umartravel.com/files/12930108880.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/rowakusorawe.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/vedopadup.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130738a67618---39417691685.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/legepufebusa.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/84496334652.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/fanelabatotagivi.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/87602796938.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/53804935492.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/nizurugefobiworijokepad.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/nazufojuwufikadatebofe.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/98358550586.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc15d455f9---lijeja.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/kolotirev.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/bexaja.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/91428014782.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/najelinitolap.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/vuzewezibimagevotibuzal.pdfIn PDF document text
    • http://trevorhannant.com/29516210028.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/wowarilinamejexiva.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16142d9c0b0c08---53452293956.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_off000105ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AC 17564 bytes
SHA-256: 59a97c83658fe9e57634cc342f29eb2b81830a38c72faa598934ce8b3a1c38ae
font_01_sfnt_off0001333f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333F 10468 bytes
SHA-256: d067ae7ad888716660ce936b806b7453d88342e16183d077f79f76771cb3a222
font_02_sfnt_off00014b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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