Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49d537abc0663d9…

MALICIOUS

PDF

79.5 KB Created: 2021-09-09 14:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 35f06506fce793e8ba34b8ba447aa1c6 SHA-1: fbf8560b4c3b8b936e3f9089763c0ba8fc82b544 SHA-256: c49d537abc0663d96f9c9d4b03980aa479c4f0e99c719abc740e9676406efafe
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many external URLs pointing to potentially compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links, including one to a compromised WordPress upload, suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://wastran.ru/uplcv?utm_term=dual+space+pro+1+apk+download PDF link annotation
    • https://fcr-fomentoconsumoerenda.com/uploads/files/67923313457.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/sizemixupuz.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/92899000591.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee00fe2388---20452901963.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/79899520233.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136e3a6c49b5---54333010682.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/1671761419.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/65893017188.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/dedepuresoberixi.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/42273859757.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/pafubilawetu.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/turevebeburetemodapefifa.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb19eaf66d---noses.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/68977306585.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/59056615732.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/lobawevos.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/79939625350.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/10756570192.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/82809665258.pdfIn PDF document text
    • http://freestyler.cz/img/file/midetafutidularekadekugi.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/17969679425.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/tisizo.pdfIn PDF document text
    • http://bushurov.ru/images/files/37494547964.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/37753792442.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://veitali.com/upload/files/1533059756.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/91778503358.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_off0000d252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA64 17660 bytes
SHA-256: 8d20dc8dfd54346f011fe0a6749c5cbeb0ce661ce2e6a2eacd9bc56d83fa1cc2
font_02_sfnt_off0001181e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181E 10648 bytes
SHA-256: 70192ece4b3fca5c27aed7c9ace42eedf4ca664d1752a1ce130fa79ff033f56b

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