Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e55b55ca4565e3…

MALICIOUS

PDF

85.2 KB Created: 2021-09-06 20:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5161bd634dbede3698f080ec052fb64b SHA-1: 817fccb621ef27b484c693a67f863f83f9e54c29 SHA-256: 38e55b55ca4565e394f50e5409863507ce359d297a497c873d0bb19a22a1242b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, indicate a link farm designed to obscure the ultimate destination and potentially distribute further payloads. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/db5a14178063a220a197b324de89c84f/43557331317.pdf In PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/81269018673.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210704013737.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/e5a5d4e8d7bd5e2d485f1d8a5d288842/52107150056.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098f88bdff8b---65167814415.pdfIn PDF document text
    • http://agro-partner.com/Image/files/13149279260.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/36142253801.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/43110810819.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16098586628359---72364358333.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/93ts4cafa4so2vlk7ugv6kf0ah/buzap.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/dcb8d3125a004e2c4068cdcbc7173186/bovozukupaxidiguvu.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/klgc2j4rkmroe729k64jn5f5nv/24717776393.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/6trs6ctd8lc84l4tmdk94i1nte/pofebesos.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/79954459002.pdfIn PDF document text
    • http://kleiberit.ru/files/file/91940272491.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/dilivota.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98ae969cf4---9590324622.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c192ba157d4---vitupatasipos.pdfIn PDF document text
    • http://techbis.pl/files/file/fubazadot.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/14491556419.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/07/files/210717054508.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dccb1478bc8---zezekozunakenuvowaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pdf+to+cad+conversion+freePDF 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_off0000e8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C7 18148 bytes
SHA-256: 0487b78bdf0e47d9a2173ed074157ccf5cc5270e647ba59a83728099d37f6dfc
font_02_sfnt_off00012f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F55 10488 bytes
SHA-256: 6aea3d5278cb5e9574c6a04a80a981902658ffc3f1f398c8299dbba9bc047fd6

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