Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a5fe04dd4932e2…

MALICIOUS

PDF

71.2 KB Created: 2021-09-14 05:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b6ee3f0e1daf93e13ba9130c6a13ae2e SHA-1: 63f801bdcfd79a14dad901577938e8f2d1060fcc SHA-256: 58a5fe04dd4932e2632cb929d81df46a1ba86737a7a0db0aa8a764b46e9e9405
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm or SEO spamming operation. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs supports the conclusion that this document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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=asphalt+9+free+download+for+android PDF link annotation
    • http://sportschoolindex.nl/images/uploads/4004479131.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a43e5db3ab---nerog.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/povedizigibateliz.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/nidojif.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/bibofororoxatodifesuderow.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/82531503510.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/84112773861.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/a86aa69824132e32214efc26d50b7724/labegadisukabuwepula.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/b76530f555f3c2bc7f200a182650075a/68860220106.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/29030050371.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/38533475915.pdfIn PDF document text
    • http://charivne.info/images/file/18781131331.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/tanobesigifi.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/faritemepi.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd9e3d280e---5613027536.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/wafisirogosipatiwido.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/57913449719.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/tosizilepavoro.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/15524403305.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/9108753487.pdfIn PDF document text
    • http://drironcat.com/images/file/93173015889.pdfIn PDF document text
    • http://grupophi.es/uploads/files/87276483377.pdfIn PDF document text
    • https://securitydm.com/slicice/file/veziwipusetenujum.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/gutetegasezawa.pdfIn PDF document text
    • https://senegal4d.com/contents/files/zuzuzegelitilumunekagutez.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_off0000b3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F9 16228 bytes
SHA-256: 4a4d273d7c0bd63b14642eef2677f8c78e4c1950c7d07ab47b204adb2b4371e5
font_01_sfnt_off0000dde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FA 10832 bytes
SHA-256: 4a8e0deab742a35481cc882e1cdf8f499947b67cc7420bfac5b46ea0fb12dd7b