Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44aa0b527fd15f4…

MALICIOUS

PDF

82.4 KB Created: 2021-09-24 12:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7a7ba537fc029ad39167bc8531369962 SHA-1: 630513b3d521b5814b6c74a5d9095875338029e4 SHA-256: a44aa0b527fd15f4fcf89f8eb7ec49a3cc72e6971adbea8380c61eb84bf8e722
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload directories. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d3464d177---zuteku.pdf In PDF document text
    • http://adamlegal.com/userfiles/file/42079840730.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfc0ec5706---xemofezu.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/76972679328.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/27694259294.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/47691495829.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/kokesukojuvufuregukuropot.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/nugaxufuweja.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/b11af14d4294e0186e38f2236b947f64/mibuduxi.pdfIn PDF document text
    • http://cke.hk/userfiles/wipufazomejaxamarujikozib.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/wevanaro.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/76771287842.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/lexisunidogaro.pdfIn PDF document text
    • http://swhos.com/upload/files/20854067208.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/58197026618.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109200659156799.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161370de201cf3---31864563464.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/xinasiribiwu.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/11251730393.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/dumevuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=video+star+old+versionPDF 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_off0000dca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA5 18340 bytes
SHA-256: a3134cd7d5d65f2bc1b6a4c31eaf9ee59df9b6ff044335422cf9c21e6c385a04
font_01_sfnt_off00010c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9C 10276 bytes
SHA-256: a73c68d16feca0f7cd5a22e43eb05e58d08ee6ed339dff6eb82b96789230a3a2
font_02_sfnt_off000123dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1