Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b66adeb82dbae0…

MALICIOUS

PDF

70.2 KB Created: 2021-09-19 19:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8afdec5ada783d84c7d5c54017e6214c SHA-1: 523a98b0bc52fb724f994c049168b5fb7c251488 SHA-256: b4b66adeb82dbae0ac00c0da4c61bea1304a5c279e7b582e5d7c17f7671e1980
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5455

Heuristics 5

  • 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
  • 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://garglob.ru/uplcv?utm_term=learn+how+to+check+your+android+version PDF link annotation
    • https://triangle-electronics.com/assets/userfiles/file/60673204827.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143da7bbc3a8---3746886539.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/xunukusof.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/83675853348.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613055066a2a8---fotilaxulegikawodib.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/rulidewapozugumij.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d776a035e2---zotefasowazifab.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210911000827.pdfIn PDF document text
    • http://thevale.us/userimages/96687210730.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/sabisuv.pdfIn PDF document text
    • https://kham.vn/userfiles/file/79032455584.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/vegaximanoj.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/35014721936.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/48104380429.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/varemekepikevenosekesa.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/77793953419.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/70708384512.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/29738031637.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/zopukezuses.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/24010511502.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/98798089619.pdfIn PDF document text
    • https://123natura.com/stockages/files/vixapevobez.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E6 17352 bytes
SHA-256: e21095f429f696f504e3718b113e3f5e4d19263de4fc5a7135c571093f0ffc3e
font_01_sfnt_off00010001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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