Malicious PDF — malware analysis report

Static analysis result for SHA-256 58576d78e8c6bcda…

MALICIOUS

PDF

84.8 KB Created: 2021-07-01 19:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9b62f6909a0360c1839f7b0ba2a74393 SHA-1: d980fca876b80a543a4a7cbeb4dac022fa9c447d SHA-256: 58576d78e8c6bcdaa0509a7eb3a6c6af84f0b8427582cefaf3e4101ae2fdbc90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.x454.com/wp-content/plugins/super-forms/uploads/php/files/9ei3f0ra0sgh97aojr9r8qndm2/rimiwot.pdf In PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2e85a260---fimegifokurilogoxal.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210612131507-gazukemawapif.pdfIn PDF document text
    • http://kasargod.net/uploads/file/livonu.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/wulamepuser.pdfIn PDF document text
    • https://bbmint.com/userfiles/file/32156003266.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/gelegadokubowop.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16087f4ecbffdf---vomajalig.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/bofuwononave.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/boxixewosojovav.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b314efbde16---18512687210.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///99274669209.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210621180049260994gukn8lpwa98f.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8e1b6979f---dogulobakag.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/755e5009953886761acb29d5c9a6c343/buvivuxabakaxikexidod.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/63608ef5d55a0ff2c9c92a45d82f6a37/36108145675.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/sukefetusezikiwijimegu.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160828699bd213---rijesamoteram.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/wugepezerurosiwe.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e067064d9f---dijuvupipepogukalegakug.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a02caf06725---biritotawimogilavu.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/dno305k7d7itqc1nu9f3ui0lrl/92519887126.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/3ocmmme3d2671a00m3vj2g7ijh/wuwek.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5e9cb79fk51cra7sebkjio6kc/26986559942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=electrical+measurement+and+measuring+instruments+by+ak+sawhney+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_off0000e2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 18060 bytes
SHA-256: 11f20a84c02f64de3c6ab56eed75289401936e9edc7455918bbe7013df0df908
font_01_sfnt_off00011295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11295 11460 bytes
SHA-256: 9c5637676ad53be1c7af4d675467b76fd2936e2c1ae1f82403ca713964fc8147
font_02_sfnt_off00012d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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