Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5261dfab07d7aee…

MALICIOUS

PDF

72.4 KB Created: 2021-09-15 12:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 155d61f14839700ca2ed7399871d0d6d SHA-1: 75ccaf91cfe2c975b80d0d24c9249e6b976cae77 SHA-256: c5261dfab07d7aeec1cbd89fc564fb596d149027f4e1c1e29a6e3fe2649f4e1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit users via redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://medvor.ru/uplcv?utm_term=private+instagram+no+human+verification PDF link annotation
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16141b5cc53d35---gopuxarukeboxanup.pdfIn PDF document text
    • http://dd-eng.com/files/files/80787569936.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/jezevisulukowikunoxaz.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/janewavukifu.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/81698152112.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/faraxirira.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sudeb.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090214114915.pdfIn PDF document text
    • http://teplospectr.ru/images/files/53679343222.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/fevawibaworupazutux.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/v5jqc7rde760i1ooq3v1mn7v1a/taxegegi.pdfIn PDF document text
    • https://sim2007.com/files/regalikutawurakalideza.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138edd51069f---71229537216.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/3f8671e5ba4f490d23413e5c2d343235/23071515568.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/628536584.pdfIn PDF document text
    • http://cartopack.be/Images/file/puwanowotodufuzilup.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/puvixel.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090922415644.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/34519359656.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/kejudupodunagekewuwujuto.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/92679970786.pdfIn PDF document text
    • http://bibikid.ru/upload/76054011260.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///74428303254.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614113fc45e53---daweruferofiro.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/20073642529.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/396333120.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/tajexatarudugape.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_off0000b952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD169 10904 bytes
SHA-256: 0c92e44bc1c1fe253c8623cf34eae25bc5df66ed09a6863e070553be2234f33e
font_02_sfnt_off0000ea85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA85 16148 bytes
SHA-256: f4a6116f4ce85cc3e840a6757967b64673cb7fab1d5d8fc846e3c3a9ae8aebfc

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