Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a9892e71084e4a…

MALICIOUS

PDF

80.1 KB Created: 2021-09-08 03:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e4dbb977275e8dbdcb4405611bfdb35 SHA-1: 0b71cf1d95613d1df78f7eeb24690863f516df4d SHA-256: b9a9892e71084e4a5797c8a864d05789d276bb560865c6cb58ae3904a88e1294
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 WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns suggest it's designed to lure users to external sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/lrvta5n76vpb3ghn4ufohsqv03/kobozajivafajunil.pdf In PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16088253f1e229---jevijawizezipimuvafaper.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/pefavidipuxavatetavesuvag.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/bbaed8290774a735eb5ead85c9cd0e4f/xiked.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/f911535e68b19830d913db31d913213b/juniguzexamofupipame.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/tigupalewenurogit.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc83a90811---61781578507.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/tajodil.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/tuzadarebovo.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/93561469789.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/2557875966.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/639715e73f4fb127482ad68494469bf6/95290492394.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/38118563486.pdfIn PDF document text
    • http://biomehl.com/images/content/files/vakuwedu.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/tifubededupalalowuxu.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/bb080333370d7bbc0af2ec323edc091b/40183202625.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/zunaduf.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/mamelifep.pdfIn PDF document text
    • http://movediary.com/userfiles/file/mafutuwogefuri.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/foxeletufataderenum.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/kifibelidavet.pdfIn PDF document text
    • http://baove24h.info/upload/files/wafaxamiz.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/34013848635.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/burikemodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=days+of+the+week+spanish+worksheet+pdfPDF 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_off0000d0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FB 18308 bytes
SHA-256: 731500648125fed3c0eacf62eebe92039e6d4f3b2b8cb7cd4a3270be3af93f9a
font_01_sfnt_off00010130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10130 10844 bytes
SHA-256: a4bd18c792de08852820b98648a6bcc20720fbc1d72008170e100576398b0c64
font_02_sfnt_off00011a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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