Malicious PDF — malware analysis report

Static analysis result for SHA-256 95421f5e45976191…

MALICIOUS

PDF

69.3 KB Created: 2021-09-03 07:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05d429c79bb23d8964ed66cf89736721 SHA-1: 8e62db97c93c1437946eb3d5e984390b26127fb7 SHA-256: 95421f5e459761914e9e2cdc468e3fb8ac61bfa6345aaedd81a9da07be28e1da
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23d2575e68---93449999721.pdf In PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/5fc1mintg7r1mtlotiml6q2l0m/12690300461.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/wivojulozelirowakilosisol.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b08b0633b275888b96b65eed6e93fdf4/94477995962.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/4n8im8mjhnet97k6o77tffmoe1/pezipogiketenot.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a4bf48d49cf3ef63ec2374882ca382de/42613379288.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/vagevikarexinudenaranog.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/vevabokaved.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/toxubudevu.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/89740a793489031f5b8d752d230b1f71/49858405949.pdfIn PDF document text
    • https://123natura.com/stockages/files/xaxutedezukagogabapag.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/5299055519.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6270ec2f0---28659847338.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/95236118760.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119e8438a995---sixukobamofeva.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/31061374237.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e603e44a98c---99828493373.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/davunidej.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/9fd7285861dbff183e54755a73044f32/57587648295.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607523f79c840---59632179592.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/49165667948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=codominance+worksheet+answers+cattlePDF 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_off0000af05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF05 15576 bytes
SHA-256: 40a3ce363edc7820e2be8c5663b17761e127d67ed4a84ee7ba2fb6f5a9b8b77d
font_01_sfnt_off0000d702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD702 10844 bytes
SHA-256: c456ea9f6d31adcb68f8928676c14948521347db290be60d3cc8f05c0e1b5231
font_02_sfnt_off0000efea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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