Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0f7a30cd66de8e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 04:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3e5f954095e6eeb7e92152ca6dbc10af SHA-1: f8e85516edd64a237f5933c491820d452b771f94 SHA-256: 4b0f7a30cd66de8e5667f2fa9a74f30ca332376beb930cc1cc7127d5b4d6fe80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farms on compromised CMS uploads points to a campaign leveraging these sites to host malicious content or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://crysiq.ru/uplcv?utm_term=backhand+drive+in+table+tennis PDF link annotation
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/c5010b574102cb84060c9cbd358d3f5a/teponefipam.pdfIn PDF document text
    • http://ecole.ru/text/images/file/tadatadubexofi.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/78129620131.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607de277cc2ee---kojosubokavefisugo.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/12283050780.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160740ff0a6ce2---34477699170.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ccb1ba895cd5977bd0f406d529a03694/bizobe.pdfIn PDF document text
    • http://atomleasing.ru/media/File/fikerekome.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/vokuwoxojesu.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/30972592798.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85ea3b9010---37456454763.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/99246386181.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/rasoxabosozufifibo.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160844c35914e4---nogazal.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cbf59f5e2---14136588805.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/rowiboloferugi.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bba57fd00ab---fidoge.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/61101073204.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887dc36244f---67132775701.pdfIn PDF document text
    • http://klhl.com/userfiles/file/59129134522.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/2544452122.pdfIn PDF document text
    • https://lapiadinafelice.it/file/kefukuvisixebujapigoro.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57362b3a1d---venutubamaz.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078672d233e6---simax.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/oh0sbdvq41k5v0ehvbbeujcrt7/dafifujigemokegitavonelof.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/72462259948.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_off0000e046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE046 10696 bytes
SHA-256: 388e2775a310b6498efc0e5860d83d7b411120ef5d9b1ef51a3932231b90157c
font_01_sfnt_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E2 17776 bytes
SHA-256: 02f5b8cebd883db9eab5522b5b3b4d18542c5d24d1fe191a47a9f098771eb979

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