Malicious PDF — malware analysis report

Static analysis result for SHA-256 28aa354e90997674…

MALICIOUS

PDF

78.3 KB Created: 2021-09-10 12:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 85c636772afda4a77b4427bb0f490c6e SHA-1: 5a7db4e8a9c3ab9d5df4ebbc0ec10a172c3aca57 SHA-256: 28aa354e90997674e7a64e88c098f0d453696da004bb32d79cdf9da3c0fb7ffb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using compromised sites to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/17108343e85a296aecd7a1fb103cb97a/valigabototiri.pdf In PDF document text
    • https://lapakunited.com/contents/files/dipuxalegebokejizapaj.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/d5166d5c85668fc02f5466c195e456de/19337119490.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/fudobuxusedekisozekexufu.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/duvexapujudojo.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fb1827fdd---80994051868.pdfIn PDF document text
    • http://digifast.cz/userfiles/87462561758.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/96233760832.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/303196266.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/3429835a5a5cead344989f4f721efa4f/desupezomuxilawa.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/12394648154.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/puwuj.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/lowemoboxe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613042d6b3cb6---vuderatidefebezufapekagi.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///70228797470.pdfIn PDF document text
    • https://ibextrail.com/editor-images/54940724082.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wowezeluj.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/porenidelepubovij.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/xotogigitef.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/kafowobozuwopovilajemoxu.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/31155590152.pdfIn PDF document text
    • http://denge.aero/upload/files/xovutejupefaledaf.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/xagarinaxibavutogozizaj.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/51352189124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=miragine+war+unblockedPDF 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_off0000cd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD71 10688 bytes
SHA-256: ee262a4b38deafbf63bcdc6f2e9b70facde6a2634e9b92d41a6bfee816905674
font_01_sfnt_off0000e5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 17760 bytes
SHA-256: a9e7d0b978d39cb1412d907fee38facb6885cd841e037325a2d9896618ac113b
font_02_sfnt_off000113e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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