Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e92c15fc34fd052…

MALICIOUS

PDF

90.3 KB Created: 2021-09-07 18:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fa26e6d838fe1d607095c078319a82de SHA-1: 6debcbc02de293a06552334d608319eaf8e81a0d SHA-256: 1e92c15fc34fd0527c09c10e40191dfaba320565e409520e1bddc2752a50f935
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure itself is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/99uopts27nlfq7ack0k2ohess5/38073032356.pdf In PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075951e78b71---85436136508.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/58638287806.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/46e4f43a45fd197eb0cfc5877abd7d26/3646949426.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/76465398490.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/korekagimasimig.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7b7225362---92441524586.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/34806837561.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/9984017028.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/56161053813.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/siwamanujowojitu.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/81659502345.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/gomovasusiselajanijetam.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/29371012517.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/47043146425.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/c5584d16443d39f26b1ea6410434c4a8/pugebigebaf.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/tonawugera.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/folufapos.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/lav70lrbc60eb7m01fjacfuafp/nipedovimobuxaguzokiti.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/wujazurobutupuparumuko.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210703090627.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884f20740f9.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/denavumopakuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=spirulina+cultivation+procedure+pdfPDF 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_off0000fb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 18264 bytes
SHA-256: ad8fcf04fbffc819f76239fad6d151e5cf48b77f2c3af3188f6e6285e56fc5f2
font_01_sfnt_off00012a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A98 10684 bytes
SHA-256: e9877f767fdba6e620bf7f727e0ecf2b1eb25e974ab4e068455b8e875f6eaa41
font_02_sfnt_off0001433a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1433A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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