Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b8aab8c193ebe4…

MALICIOUS

PDF

88.3 KB Created: 2021-09-05 11:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f37ad34992a65da1f7e41b52d17883bc SHA-1: 95cb21a8e58a038dda9bc81f1bcf451bb331663a SHA-256: f0b8aab8c193ebe42086d3a1aa0eec2ddc6e11e9e1339cc2f66965516d4e47aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The primary function appears to be redirecting users to potentially malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=comptia+n%2B+course+outline+pdf PDF link annotation
    • https://netcsemege.hu/ckfinder/userfiles/files/ralelolusatifakituwiniker.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/2de816e039b058555de582f60ed2e97e/motenefaxivatidirosomu.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1627424815.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a97cf1b2---55718916608.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/dcc859f61c0685057cbf6198cd0adc30/tamebujugafefot.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803ab488b27---numekugumusuvidejusi.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/bixirixodizisusaju.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/fifeniredejelafejakaralu.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/gi65u35ad5irplrhcvc5tuii9q/78154368459.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/uv0kv916sc0k77uhiiqtf9h1ki/benifegokixorenunumuviju.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/ad72efb62b4fab93ea7f89cd8663fe80/35080998236.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/2217357239.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/77241857338.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/a6e33f210a0f88a9cf4a954d9b30484b/38873770002.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/83752733960.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/gepinetumazusuxijog.pdfIn PDF document text
    • http://chichen.asia/ckfinder/userfiles/files/16795616403.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/53816263994.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1462881365611913d3003e5.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/12c3583c644d42cadb4e77e58c18e310/74482805677.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_off0000f411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 17716 bytes
SHA-256: ccee162b90845a9f109d87056333ded30af0a7ed7465a25fe18c9af5faa2da71
font_02_sfnt_off00013a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6B 10912 bytes
SHA-256: e7291525be12ae9318b3ea701e10998357b0c158a3bde424d9aaa3792d366066

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