Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44c607263dcc215…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 08:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 34380e8110fc8bf26b23a3cfb988005d SHA-1: 59cdf1844fbe4b15d8158eda5cb33fed040f9d13 SHA-256: a44c607263dcc215ee0badadb494a276c9b2d157ee29e3ee4df48287bcd8d1c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and utilize UTM parameters, suggesting a phishing or spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://krisoc.ru/uplcv?utm_term=resignation+withdrawal+letter+pdf PDF link annotation
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/381a884cce9cafa4802a6fdaad27b25c/96805028808.pdfIn PDF document text
    • http://htygroup.com/upload/files/lilogu.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/emft6kpkf12bvephf5kdjtcsn3/67016041256.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/0bac4f357ac9f1544d9a79cb0ffd3aa2/69927248554.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/1527aa25ee6507cd274ed330b4e82c04/tasidowebojoparoketo.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/12656944431.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/71528153052.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/72808824576.pdfIn PDF document text
    • https://ysh.my/userfiles/file/5963121831.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/dozubufo.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/fodusuxuma.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/13350742647.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/39481d18cf5b4b59e20f132d64344c37/75198291445.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f085d0a0f10---4087975466.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dce135320f---59001507743.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/pokamejif.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/80793587986.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/xuniwebode.pdfIn PDF document text
    • http://labonscafe.com/userfiles/33328405639.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/jegakitafewikiwemegexonu.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d11ec6348d---buwusenifekegis.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10464373651.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090585537e74---zixekulazopameleli.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cf71565f8ec---20345372050.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/wamanulajidomegoj.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_off0000d8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BC 17408 bytes
SHA-256: fc865caf8c2ec61f8941620e18f300a0ad34fa44f14c6e57a9ab9690e4032a45
font_01_sfnt_off000105b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 10908 bytes
SHA-256: b35a8bf10f34d17bd6da490ae697bc6c3841cf8e94b397a65e5cc7f990b0146b
font_02_sfnt_off00011ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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