Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5ee0ec7a7db050…

MALICIOUS

PDF

73.1 KB Created: 2021-09-17 12:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2bb4ae5248754447719d8b749c0bb0bb SHA-1: df9865cbfad0b8201feadb05c63dbd23a1c62080 SHA-256: 9a5ee0ec7a7db050d17adb796ac287fa6f5b881c39e57b03d5f560cb30ab7378
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://vlajkylevne.cz/UserFiles/File/zalolu.pdf In PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/58ma1ujl6ddithnkjggvbjo5mu/77536483765.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/40757276108.pdfIn PDF document text
    • http://azizolace.cz/images/file/71790332778.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/negavofodexewedoza.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/latemizigelid.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/fumanozuxomasuka.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/jivupojanamaxazojigisem.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c63ba2315d---28011341232.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161320e9c46ffe---91613085197.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141691b47667---gewisalopegatiboval.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/tuvekubeduwolutokipe.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///woxunusinigov.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/37658863293.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/zudekopazutulusegagudax.pdfIn PDF document text
    • https://tekartltd.com/upload/files/49857556144.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/ad727ff246f7f0300476a0ab3c86bc8d/zedegitapos.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/nobigitaxiluvejubaxosi.pdfIn PDF document text
    • http://projektovanje.info/userfiles/file/zamaxuripadedep.pdfIn PDF document text
    • https://papiratisk.cz/soubory/90463701065.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/16404436096.pdfIn PDF document text
    • http://charivne.info/images/file/23700046706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=wondershare+mobilego+for+android+macPDF 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_off0000bb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AF 10960 bytes
SHA-256: f6850fadda4bdb74458f524cc0d957275216d8bebc4ad9e887ba56e223c4def1
font_02_sfnt_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 16440 bytes
SHA-256: 537e18de7985ac01e64d74631a4f0c5e8306702a7d463278a345c37a70a5f957