Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d5aaf4c9909ba28…

MALICIOUS

PDF

72.6 KB Created: 2021-08-30 21:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: a805b604859295ab20d0fa5d9e5d5495 SHA-1: 033dfc65d0a8d4e16532b748e12275d4b936bda0 SHA-256: 0d5aaf4c9909ba28056a26f6edf4ecfaf2de2847f6d48d2c60cf510ffb5bbce6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=surge+medical+meaning PDF link annotation
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddc83d38cb---22664159014.pdfIn PDF document text
    • https://filetorme.com/upload/files/pufenudezononamu.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/jejinunis.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/65725939190.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085f35e92091---xutemokoreze.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad13426849---26595824693.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/25976979883.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/tewitenabazexesixuvexazu.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/48797405296.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/jnisk6ie9vggkriqgvbqekcno0/99065463076.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32058076533.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/3ec3b52d404bfe5191a72d8e4bd1fa5a/50347785547.pdfIn PDF document text
    • https://xistenze.com/files/files/regufa.pdfIn PDF document text
    • http://lowndes85.com/clients/d/d3/d39312ffd46aa2fbcc4e4de04d96a17f/File/19726493326.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/35840456486.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/sumikadupilegibataw.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f190b4739---1647461309.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/48890819238.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/xaxabuwi.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/5b19d1d6190b183ed1c51cd9f234b572/54198713240.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f009ae66fd4a840dae8c861999bcf589/xalogemojebiku.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d7d224314---dawuz.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_off0000bb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB17 10504 bytes
SHA-256: c1f73a6fbeba46392d8f1c0196980dcbd3822fb039deaf4a8f033b2e6f3209fb
font_01_sfnt_off0000d2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A8 16432 bytes
SHA-256: 5e18fcc07d8c58a57313e3bf85bdf4410298bab3308ba6e1fae37d0b49779386
font_02_sfnt_off0000fc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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