Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4597ab006b1fe59…

MALICIOUS

PDF

117.3 KB Created: 2021-07-13 17:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6dbf3c2852e9bbc252717158cbf054d1 SHA-1: d0bef06db64a482d482955feed32f1d5ef7aa7cb SHA-256: d4597ab006b1fe59414ffb36516e8b1344a46513d6bb085891c976d32f445e07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified by ClamAV as Pdf.Phishing.Trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, forming a link farm. This suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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://archism.ru/uplcv?utm_term=american+sign+language+dictionary+third+edition+pdf PDF link annotation
    • https://reitinguok.lt/userfiles/file/55907202829.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072da9ab435e---68118166482.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/gopulaxir.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/975b26c429b7e88a8ca253cf638ca36b/19722664191.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cc1f80cb8---88151333963.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/8f5039d4180a69434cae4a363dfc1dae/7755622144.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa253396f5---95086048722.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/74599625752.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1c81ac7db---zelegenuvogenedoxivu.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/dutufetagifekodolateraxof.pdfIn PDF document text
    • http://getem.plfiles/file/19651237894.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/punikikipuda.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/csksbj54dsf2ghb3red59o45ib/87177028915.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d55234de66a---fezejilexazikivi.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/de1119d25f859d136b3d363cf0ca79eb/sazezuroribugipi.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608260607881d---zimewuxi.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/18513407460.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/ci07l5imnl470eaohpq0jj7n5t/21236193707.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/dadinidaj.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/b3fa9b6482eb89a217551ea2065a7592/xavikejavakalalupusonik.pdfIn PDF document text
    • https://biocoils.com/img/file/26115400941.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a3ab298de36e357630ee869241e09606/gurumixubijekemikojobe.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/77512972352.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/83510232998.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/powigi.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/asqcdtbppl7fnl1u5h8u9dt0qs/74749783839.pdfIn PDF document text
    • 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_off000167a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167A8 11260 bytes
SHA-256: 70413741c0ff47c836ebfc0b52904515c8eb9a2290dfeec075d98ee6526480a5
font_01_sfnt_off000181b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181B4 17864 bytes
SHA-256: 1de798ab628efc6d5fb8f06033eee8e1fac644468a28a4f08e58e86947c9127e
font_02_sfnt_off0001b039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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