Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd243544dbe927cb…

MALICIOUS

PDF

83.5 KB Created: 2021-07-06 19:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a1a593f77fe3ef56a22077f82e5c6b7d SHA-1: a0837376f780ff365a59fa4f1e3b7ebd76ae7d5b SHA-256: cd243544dbe927cb96c85793f0361314bd1fad2a0668fb762a210e1814a18498
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, directing users to numerous external URLs. Several of these URLs point to compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://asiarsolutions.com/userfiles/file/76632909486.pdf In PDF document text
    • http://mppscstudy.com/admin/usercontent/file/toxigamiputibol.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/088e4fe6b365906d75d6f2520437ac09/40466942689.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/48594636928.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a796ce16557a94972935450aa5a5f113/somovomuz.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/10289134487.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/9a204dccc67d97df3243b7616a401061/nogisati.pdfIn PDF document text
    • https://artbynela.com/uploads/file/99467707272.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a091990d840---revuw.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/gonejonirozuko.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/01d660ab79ea600f124f70367078a913/vomomunaxowipafepazerot.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099eb9b50c79---25112835946.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/35463918141.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075038c45a22---69679582689.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4e297807250fd97f22e14b969f6b32b0/goxukibotojebok.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/0feaf5c28a6bc77eb9f00852d70f21a6/34691578201.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/tebawegufojivuzo.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/11852893165.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ee07299f5e043e1f4d84a80fc5787b29/tutowi.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/41850081360.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/wutefozoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+calculate+area+between+two+curvesPDF 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_off0000e30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 16736 bytes
SHA-256: a23ba4e22db978f43580560f48c974fa0629e0157895c977dd5515edf21af7a1
font_02_sfnt_off00012712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12712 10516 bytes
SHA-256: 794d34ceef2b5af6332af68d0fda6b927d8bfca2438c0ad5394a1377fc1296a5

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