Malicious PDF — malware analysis report

Static analysis result for SHA-256 b290e947063a3a54…

MALICIOUS

PDF

68.1 KB Created: 2021-09-29 00:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e1e9f03c2e7585c3e938eb55f994b79d SHA-1: 5dde371dc86a6150b0ed46464927b56dc28593bf SHA-256: b290e947063a3a54b443f5fb0026f60a49a5b1663d745245d3aceca58013ba90
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df918d0a55---lemiwijinoxepoxigelel.pdf In PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/62864280127.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/40707188829.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/98541392966.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b1e9ea6bf---dutejazege.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/kojureduzef.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/52444673676.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/semulelosolerisomeke.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/sutojebejarabowera.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346387a04a7---93158775568.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/jexiwojilugojegipowujen.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/tarisuvujotiloz.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-18/20210918104818251508.pdfIn PDF document text
    • http://congtrinhxanh.vn/media/images/upload/files/nexan.pdfIn PDF document text
    • https://cedd.saglik-network.org/uploads/file/51947511839.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/99362681754.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9bbde8cd3c21e7ec23219fc775275fea/68351537244.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/29460333769.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/jolaxipiselususa.pdfIn PDF document text
    • https://papiratisk.cz/soubory/36400117016.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b315aa908b---votavigitumasanajum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=demon+slayer+ep+4+eng+subPDF 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_off0000ace0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE0 10836 bytes
SHA-256: 15d20b4b774c0a78344815a28a31f2f6e33719aec911f616e7239a19a85360d8
font_01_sfnt_off0000c5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B8 14724 bytes
SHA-256: 03f38b472572417b4992ae59a1c9ee6c774eed26746f4630fea15ffa08e0f618
font_02_sfnt_off0000eaf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1