Malicious PDF — malware analysis report

Static analysis result for SHA-256 b893bd577cf9e3f2…

MALICIOUS

PDF

81.6 KB Created: 2021-08-02 18:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a24e76833bb7b778a3abf7b26c0a70a1 SHA-1: 76133b7dbcb8e5c711a2c61f98ffb5faa106f52c SHA-256: b893bd577cf9e3f2d7c47e377ff46ddd2009ce504f84096d96dec2bcfab4097f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document may be disguised as an invoice or payment request to trick users into clicking the links. Although no scripts were explicitly extracted, the presence of multiple PDF link farm heuristics and a high ML classifier score strongly suggests malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://kulturazebrak.cz/userfiles/nagedizalekuvigo.pdf In PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/d1cafaa09ca62744395d11384add368b/13230844824.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/64734873312.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/99pi3tfguu4nqtnh0bs5fpntu3/gebak.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/56334649965.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/97063126848.pdfIn PDF document text
    • http://derma-dts.de/files/file/rogivilamet.pdfIn PDF document text
    • https://efnnma.org/files/file/kapusatexi.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160842a938dc41---deguwaloburapikiwuta.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/nilesevofo.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/ledupi.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/jbtfb8b5518qmi0dsteam49om8/69537651292.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/12566795548.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/3387dd55513b0c612225074820241e5e/50697775467.pdfIn PDF document text
    • https://drsaman.com/files/93573257985.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/44688956736.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42fe8a5273---vuwufumu.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/uualkhdttej869fs4vkef7nk4v/meperiguguzawalesuwamopev.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/2arsibrgvjv4i2iic5a7s401ds/48027222316.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/89992245976.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/nikodekojapugunow.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab271d1a11---pozadipotuzorivutoku.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/32fabee62ea3800b23188ecdc2bf09b6/mulolojawagetupe.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100392632987---84149629724.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/sobadokamixorasudodupok.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9294c0a1d2dc44238ceb0745028be79/35449605033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=fedex+international+tracking+phone+numberPDF 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_off0000d9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D3 11204 bytes
SHA-256: ce7edca647cb71f8e699340529c007935fb98537272afe0942eec486fe934b80
font_02_sfnt_off00010b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B61 17324 bytes
SHA-256: 1cb7a4f91df02d34f44cdba216749a832f4e434970a0f0fe635fd5f47027ce5e