Malicious PDF — malware analysis report

Static analysis result for SHA-256 023f7b626c1869a6…

MALICIOUS

PDF

86.4 KB Created: 2021-08-18 04:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7897e09e7d2868c7f6b4eaa38c711605 SHA-1: 731d6f1e18fec0571b6152d6df053b0f74752a9b SHA-256: 023f7b626c1869a6a2147dbb32ec06c114dd8dfb900d66ad78c6403e9c064332
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to potentially compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination and potentially track user interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2e8dee687---fapitigapuwiza.pdf In PDF document text
    • http://ebrinteractive.com/userfiles/file/tusaxasavepanarod.pdfIn PDF document text
    • http://dothi.info/images/files/60549639305.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088628387191---11045757903.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/27378064866.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/psa0upnatnp1brs0sss1lpc7f1/fokoweligumekoxuzes.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/onsnshdilfdqiuc1slfllgb1r0/18481419944.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/cf0j9s13mdi2ocv7j70rkas7t3/liweralozikefobilasikowef.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/94042125406.pdfIn PDF document text
    • http://www.pvvc.cz/files/56668026534.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/69154918131.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df617d365e4---takegefopelogusoz.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/73053994517.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/152e004e1b9871a778f517cc09614887/96084020437.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/rabulere.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/99831809754.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/kurapugogusitalose.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebb14037a6---bidali.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/jizuwazikasifokarurobo.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfc2494036---68293066747.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210804/file/68778274424.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a560e91fa---72366916684.pdfIn PDF document text
    • http://monroehighwildcats.com/clients/40160/File/timajet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=exercice+probleme+division+cm2+pdfPDF 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_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 19496 bytes
SHA-256: f069a4370f28910c55e3f042ce60b8126bb87ea040ef0d4f83526a647fe842f1
font_01_sfnt_off000118eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13102 10932 bytes
SHA-256: 32ac035a07692042faebb6b1a9d17df203fb4952802faf5a0c1b6692384553bb

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