Malicious PDF — malware analysis report

Static analysis result for SHA-256 40202f285cb99452…

MALICIOUS

PDF

86.5 KB Created: 2021-09-21 18:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71e5490214ffa8e711bcf2a3a0f9d16f SHA-1: d4a83b4e6b81d6f962df46a6c75d0924c4057bc3 SHA-256: 40202f285cb9945245a1078fd6f70090a7d4452c1fa981c6ceeb4abc2adb61c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. While no scripts were explicitly extracted, the PDF structure itself likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • 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://thietbidiensino.vn/media/ftp/file/sexidugas.pdf In PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/negevunivovile.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/revixokolo.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bc8a010f3---gawaxolikabag.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/ranobaparajiwajazu.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/49954044581.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109162215238788.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/57989624926.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/kawop.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49651136324.pdfIn PDF document text
    • http://csc-027.com/userfiles/file/20210920045748_0mb3ab.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/roluzenasafamixu.pdfIn PDF document text
    • http://didula.com/img/file/22485501452.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161327c000bb57---46049742954.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/89235917390.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/60761657691.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/giribejupije.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/84673733298.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/ladekobutivokax.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136544d6c31a---kofaxizetomuzad.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/dedalajeturogozom.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/70211273306.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/37905475866.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/5892429172.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16148f71915f94---sububinofazelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=samsung+emoji+keyboard+apkPDF 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_off0000df5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5B 22728 bytes
SHA-256: 98106d5f8e07e0e8dbbf0f621515e5c078f898444bbfb431df2076cf7db13b98
font_01_sfnt_off00011a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13272 11240 bytes
SHA-256: 288b085ec0173f6119e99a9aaf3c6d865ba953a1b677251bf40d8941f9fb09a0

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