Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8af89b4e1670a3…

MALICIOUS

PDF

98.3 KB Created: 2021-07-02 13:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 904922ef5990bfe563c67d98c68ec5b0 SHA-1: f0d8988c2bb0389521b1d74ad123ce1100f5c1d0 SHA-256: 3a8af89b4e1670a31d5e0b62f2cf60d38f625e67f8c44cf04290b33c41dfde0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the structure and URLs are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://allytemp.ru/uplcv?utm_term=cory+swapp+suicide PDF link annotation
    • http://baigeleather.com/userfiles/file/jaretisi.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/voxozosanop.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/3ded7365b6aa80c4e5589624882751b4/89644953711.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/dslbnl96l8jdvod5pg0d1bm3dq/jokudeto.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60B982346D072.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/rafidoji.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/8craequbo8pflb2i4839fprvok/reforosiviwanositijedodam.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/maxutobodubuz.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/jugurasubezanas.pdfIn PDF document text
    • https://schmitz.cz/res/file/850047489.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/rugunuwilajazexobifegejo.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/goxosi.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160aca01a61ff1---35132963145.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739ec64fbee---69930755317.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/beseroketizininekaje.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/fobezogedumafu.pdfIn PDF document text
    • http://faradbox.pl/files/file/29737925737.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/203502460360ac94fad2af2.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/xegixaf.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/562eea6108d9ea60c854e7ef10c4493a/40980128543.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/57215884132.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160760882d24aa---50139896883.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_off00011e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001369d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369D 17304 bytes
SHA-256: 9c9b9205789c3fffa7039ae158406cc02a23eca42498c6c46c3c8d6a47dfbf70
font_02_sfnt_off0001640c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1640C 10588 bytes
SHA-256: f66360a5662db8a586deb67dcc69b52b407610d9324170d679c8dfa139515183