Malicious PDF — malware analysis report

Static analysis result for SHA-256 068537d3e20e346d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 11:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ccf01dae3c90bce204e0b69951a4453 SHA-1: 4d3b4377e8f424857c3a9477ffdf622464e14b60 SHA-256: 068537d3e20e346d406d882292c288a048f776d3602d529c48d3f97757df1a1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm with numerous URLs pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and compromised CMS upload links reinforces the attack pattern of directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/sf5t1hfl4pp9l5tg43ne8mutek/73577719418.pdf In PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/f2gkgcb1gnitu5ju088bkoo6nr/51279149277.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/95196179643.pdfIn PDF document text
    • http://eksternest.be/images/file/45880297269.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/kusurewafubibi.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/nusivawomizudizi.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/aba5d8ab0a8acfe76db18313de09e00a/18631376559.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/74264074988.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072592670f84---36566681656.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/76540d23974b282cc43c66787fc0bc73/disegewaperojitalimuzizo.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/bb1816fa4fe0525d5450c134cc07dfa9/5639911707.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/83397312499.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7b3c0fc4f---lukedugudenotazivegatiri.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/fukitejadujezem.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/jevama.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///83575636304.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/v17ps9d7j40h7krr5ia5237reh/jenoxosuzinabafijotutewiw.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/kisiris.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/vf732miokmpsvrbjo2agd60986/nubusizufenapuguzej.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/968a0c608fab79c2fcadd3bad142f6e9/lufugodinutobisopux.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/tametokomoba.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bcccff28ce2---47314591334.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/ce9459a0416edcac62b289a597f7f4a6/19011718587.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/zurugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=manual+dough+sheeter+for+salePDF 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_off0000d688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD688 10636 bytes
SHA-256: 8dd0544b1a128645c7db4737726e1d7250eebdf52d430836fe79a9360984d607
font_01_sfnt_off0000ee9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 17572 bytes
SHA-256: 90635f681b9352e4940f615cf5b79ef6877d3a2645a38b6728cce3cbd60943e8

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