Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae43c6f5f2781460…

MALICIOUS

PDF

90.9 KB Created: 2021-09-05 19:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a947541e18680680dc14139be9c63cc0 SHA-1: d81baa19a93b0964314a9092ddeeda5b703ac498 SHA-256: ae43c6f5f2781460a26d5a58a374075df0aa1b25595f650f2c859522f5aa0a31
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains a large number of external URIs and link farms hosted on potentially compromised or disposable domains, suggesting a phishing or SEO manipulation scheme. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://catamma.ru/uplcv?utm_term=supermarket+logic+pdf+free PDF link annotation
    • http://mishelik.ru/userfiles/file/90186386135.pdfIn PDF document text
    • https://pisangmanis.com/contents//files/18401244403.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f537200858---2767283416.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/39743741720.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/xoresuzefapuripisiw.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160700bc21372a---55847284618.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/dotorapozagurota.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608d47db17487---sexajesusosomigu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/gaguvarug.pdfIn PDF document text
    • https://safehouseservices.in/fckfiles/file/18944756495.pdfIn PDF document text
    • http://dichvuwebsites.com/media/ftp/file/zemosumejeranivulolofuzi.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a2bb721b39f763747702d40ef8745c60/rokuxodexokuji.pdfIn PDF document text
    • http://glassco.ca/clients/9/99/99aa1728c1dafa3cf8773a75727b87c9/File/97027418904.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/71725318152.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/48123366663.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/garukudemul.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dd82ad5df---81817882253.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/05b22288a5bdcc34439bb426b9220ee6/46096383581.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3a15aef50---pasifumofezipipijeratu.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/vegenuguju.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16100d7cbcbd22---lufexemademukatuza.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608044f0dd0c0---buxopezeroxilexo.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/9b029aa6f91d78a225301ab4dbbec92a/bunagutafazasesiwewepol.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_off0000fb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB10 19020 bytes
SHA-256: bce97e0daf5b846bb1c36e07d6c89129b5f345ce236f73815d6a931183415f34
font_01_sfnt_off00012cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB8 10960 bytes
SHA-256: f85ca627273f49e939a9930cabe369af8f6dd805c11927542b5869fb68f86e3f
font_02_sfnt_off000145f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.