Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2fa1b3919c7bc43…

MALICIOUS

PDF

76.0 KB Created: 2021-09-06 19:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 96d017b3476032dd69361fd13f165686 SHA-1: da4ece7d96de090120316e559ce384f812c5b249 SHA-256: a2fa1b3919c7bc43c79740911030724a7fde6c50e98fb9a9c7d813ba31311b0d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm or phishing infrastructure. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong likelihood of malicious redirection or content hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://inwebjor.ru/uplcv?utm_term=dna+chemical+structure+pdf PDF link annotation
    • http://fredericjean.net/oplusco/file/1679668476.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612343ffdad71---74540089775.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/67f6a944bd8eb5a9e57cc23df8231e6a/59749707009.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/nomenowogedanipixokix.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d106d64f46---satadosasutubatek.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/viloguse.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/5389735102.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a92658fa1e---fevilezita.pdfIn PDF document text
    • https://telenovella-bg.com/files/vilexupa.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/fijarejolono.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/88453931378.pdfIn PDF document text
    • https://anfauglir.com/images/file/logesumexovegiliw.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/86967015335.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/91a0b532e5d5fce8825d23f901ebbd1e/dubirejesa.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/25582009218.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/ccbc9fb44d8dc788ba09c9d6e011c4eb/doragukiz.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/26723759580.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe106630df---71775924254.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ijbe0dp1onre3q9ro86aalhev3/34580898232.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/bivisitemusupije.pdfIn PDF document text
    • https://anfauglir.com/images/file/fetuwije.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/denubipef.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210810_1B106AFE1CD381F9.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_off0000c548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC548 10868 bytes
SHA-256: d6af225c8fe491cc625e20e65419cf9765912abcec587ec22d4e568ff13f964f
font_01_sfnt_off0000de24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE24 17088 bytes
SHA-256: 95867e105dcf125be74113761658bb2605ee34f977c940bd9df816fcf70c5427
font_02_sfnt_off00010a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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