Malicious PDF — malware analysis report

Static analysis result for SHA-256 de54e3d83a720936…

MALICIOUS

PDF

72.1 KB Created: 2021-09-04 00:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ac744fae7e927b3206c4823733097a4 SHA-1: fbde2e849cf18b3c02c61f70de776360a3a5d730 SHA-256: de54e3d83a720936487ecab01700ae15faab8fe0496b7cae49c4fe70da851afb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's likely intended to exploit vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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=via+de+lectinas+pdf
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/togegabojowepifibazef.pdf
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/84180784918.pdf
    • http://philipsphotographystudio.com/70033256294.pdf
    • http://lawngo.net/fckfiles/70294795870.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/k2g06i4f7hmc771ti02vh4ns0t/35636845838.pdf
    • http://sxsasa.org/images_fck/file/1629978856.pdf
    • https://propertiproperty.com/Uploads/userfiles/files/95722069887.pdf
    • http://bobmeetin.com/media/galleries/files/boxifijaluxarugumude.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/cf8727cf4b3a6c54c87f10e704acb529/fagulategibe.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db02f086ed---mimenijodude.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be32619dfa0---78552040229.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1b406314ea3cd8ff389eeb9cee6fb4d8/kupasarimij.pdf
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/zapomebuxuvodatolepaxus.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/32c7v0h4q8khobj0e1jpur4ii3/pakitowogalugina.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abcf06c7ce7---tawolirizezelire.pdf
    • http://www.heatandgas.com//EditorImages/file/rufokeb.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/50b2e763ae3c5ae18ad9640afdf8b643/88842617757.pdf
    • https://immobilgold.com/file/vasixekedudopomo.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/a566749ec0fce061153b79c64f368901/sunivivajifeku.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/a77bcf70daa180ae441726af60cfe2ad/kimoxarapopini.pdf
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/2299139765.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9af.bin
ea9b5ea8602d91325d56f8fd359fee6ca17fca46a3eb1574fac0fe443641896b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AF 16348 bytes
font_01_sfnt_off0000e387.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE387 16792 bytes
font_02_sfnt_off0000fb9e.bin
f9f733be8f9c2a6c0f284aa6266e21d4c330c3d613b28f5cc5ab024e18447266
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9E 10364 bytes