Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea5550630635d73…

MALICIOUS

PDF

110.1 KB Created: 2021-08-22 06:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 01f4e031349cefc5201cb84c85486323 SHA-1: a59cd643b5a424e9abdf9c453eea855c82685872 SHA-256: 5ea5550630635d73a0d5ba1abb633b2b986c72d21c14b15e67f55acc2d755946
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://kalkulacka-hypo.cz/userfiles/files/60721739932.pdf In PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608967e3907b8---bozotinapatefel.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161139019561b1---givejaponarivudekimezawat.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a451ce2fc16---janorimezikorinumeweg.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/tosovapopurepepivarad.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/xenetiwizebozivunexi.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/fadorox.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/244983731540ae6caedb10f591376bc7/xeparugozuvuruper.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cf4b049df---vujotabupavezulivivuzus.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f184cf42994---33494806677.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/tufuliju.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/duzokegorag.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/2643895452.pdfIn PDF document text
    • http://renovator.cz/files/file/10417173166.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/ponetawineduvakezo.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/kexiburasuruzudazijapi.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/dawidexojawawili.pdfIn PDF document text
    • http://synowka.pl/galeria/file/46018036649.pdfIn PDF document text
    • http://bettekingproductions.com/clients/874300/File/67676898254.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ccd0540463f2e3bdf81703f697b1e4cf/naguxapunofumoxe.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/2837458808.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c96dba63b---fezagotoruvavetagefuvine.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/03ceaf87a7af644a6e97301de013dde2/lunupejizoxikudexavimirig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=brown+and+tan+mini+dachshund+puppies+for+sale+oshkosh+wisconsinPDF link annotation
    • 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_off00014b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B9B 16948 bytes
SHA-256: 5df98a0dd9c84c0d3402d74fc8d199a292172dfbc71c85ce223993ed52f0cb73
font_01_sfnt_off00017781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17781 11216 bytes
SHA-256: 3a587f9cbf0db54d777377af9d05c487bbd9befb0ff311882fc4d1c1265705a7
font_02_sfnt_off000191ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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