Malicious PDF — malware analysis report

Static analysis result for SHA-256 279c1fe86dc1af5c…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 11:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9354671687ef9d708f42d3e592b27fb8 SHA-1: 8a66211adf6433311e5c40b143cd67925143cf9e SHA-256: 279c1fe86dc1af5cec49e78e69b92da2a8c901701b51ef1572beccd3fa5931c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://huntic.ru/uplcv?utm_term=poems+and+their+themes PDF link annotation
    • http://ettorebelfioreliutaio.it/userfiles/files/mamazugujezodazire.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/jomanepijo.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/47429441965.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/xoseret.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/38283194415.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/39353266015.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/gipakekelajadidepubikubi.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314e3f71a88---16954383540.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/269571883.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/pujiwibubuso.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/58645264098.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ldkl08qaq1e88gidp61qoe0mbc/gilekarolepoxenofiseme.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/segowotosufavelorad.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/8576025902.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/61269420048.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/nemojarixisod.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/12697107781.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/6kkt9pjgvsp2u3ln34tu24m042/56889888131.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/91167074356.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ihhrmslqhs38c97kgdt1d99ul0/27630514962.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/74565206105.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/26278930828.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_off0000dc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 16724 bytes
SHA-256: 61246b2aea9a9c8906ea0f66263400516b528982750fb714a8d9c7b4a3f000a2
font_02_sfnt_off00011f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6A 10468 bytes
SHA-256: a2cae9e2c79d1680415668b444e88f70425a60cec7e9b4995740e9e1490cb4d6

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