Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7512ba8e183a47f…

MALICIOUS

PDF

89.9 KB Created: 2021-09-02 11:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1db28467f802eecea2e57d6caec59cb2 SHA-1: 732f4188d05008672203ff685231a6526a962f82 SHA-256: f7512ba8e183a47fec5186368e516839e4cb1391b22cf21d551a9ce1e16394b3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links is the primary indicator of its malicious function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16100636e41ed5---18986327903.pdf In PDF document text
    • http://perles-del-beya.com/userfiles/file/87111669486.pdfIn PDF document text
    • http://arablift.net/userfiles/file/belexoxiwigola.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/94614955655.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ct2i5f585rufvf130i3rega6n6/15390562136.pdfIn PDF document text
    • https://buyafranchise.org/files/files/74209998008.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/fakomukugirepa.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/cdda6763af1b0be786d9f6134854ca3f/kisipofaxamopud.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a30a1c90d95---sokaxifobisodugojunaxewup.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/84710600803.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/34393676797.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/23818171645.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/61596833540.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/jidafov.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae5bf47236---5677680373.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/29111679436.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/mojodopisodokikabajakove.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/35417299767.pdfIn PDF document text
    • https://subarini.ro/mm/file/fudoselajifunaxofik.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/qu422tbhqfqadq5ebj1sqpatmo/miram.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/sagawenedum.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e93fc27218c---lulimugug.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/hf229r2h9la0h67bu9h78529cm/powopipipegenamononix.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982e24e685e---tuwotafukezevesomet.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c4490d66e---55496940108.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ir297tpvadvttgl5g5mm244noo/kidodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=poverty+reduction+in+africa+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_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 20160 bytes
SHA-256: a4c761c25967579e4d62a41d58d847ea03f6d370b333efadf3a578fa6a7e0b4b
font_01_sfnt_off000128e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F8 10680 bytes
SHA-256: 12d51ed51d283611015a211018863712c95a8338bfd94ab7f1367c6f0e1f1147