Malicious PDF — malware analysis report

Static analysis result for SHA-256 896a324f8945c003…

MALICIOUS

PDF

104.1 KB Created: 2021-09-06 06:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c81c4acbc6a254300e60d3d86e5948d3 SHA-1: 84b65682de72503a0e37eea0057e77ae631f7495 SHA-256: 896a324f8945c003e2a0356c2209a57a49cb4401fb94e68e9756e9a7f2760cb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to distribute malware or facilitate phishing attacks. The PDF structure itself is heavily obfuscated and contains no readable document body, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://tamker.hu/userfiles/file/gozinob.pdf In PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/dbec2ff50dfd401730b311f80927761a/39568857611.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/e8847f27a8ed9cf0aa23c9a0ac50239e/lotebeligefesojobozimik.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/58dc198046ec4022bc4d7bd00b24c549/dosulopevevoped.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5db6363ec4.pdfIn PDF document text
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/94014043273.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210616042101_hvtiu4.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/nqs1inqm7ckudt8jkb3iqt2fr3/mifir.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16103723225aa8---75027167770.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/5475105029.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/kudatiraropejaturadisoz.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/26607013606.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/b0e69b12cdbeb007bb41e02a301b1bfc/takivuxasefusavavoga.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099a1225680d---70851425480.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7cc4a26f4---59291869108.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/pufil.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/94860269232.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/c4fb1de729911de6c246e886c362dbdb/16996589382.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/6b8c9b365029e5d813c44bd17257ab3f/kumazawiwonenaxipe.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/00afe6488e5812dce0521573c3bd2bca/tugepenuleku.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076695b5d18c---topudulewolopolopavetaj.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/1a7695ac304a59aca514e6241904fa88/mifefuwuvagakixafaxesupaz.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/zazaf.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/be757ad0a8e905f8b4ade65f8ca6a08b/53571990863.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23cd9e4d1f---6202135783.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/xobakaruturisimegodan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=after+effects+shortcuts+pdf+cs6PDF 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_off000133af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AF 17956 bytes
SHA-256: cd2a65d7c99317fd741a12fb49db43e70c3ac9c9431606e59138429ce2d7c318
font_01_sfnt_off000161f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A10 10560 bytes
SHA-256: 72106c5ecd800723b4933ef72d741c8a7a81e5e7a8772e8dafe274b71b427098

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