Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c8b5de18254833…

MALICIOUS

PDF

88.8 KB Created: 2021-08-06 09:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 366e0a7f9e0b4a03117cc7c2d3b918d7 SHA-1: 0b83f5f7a9d8ee86e48fcd8c6072f4d3c2fe30c1 SHA-256: 20c8b5de18254833e6a51f0c0462e82ee5c0129ba3c2baba59e4a26834c3d34b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no further context on its specific purpose beyond link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/c2e51d045ac9226be0473a0ab2b7fa5d/kugivomusogajuluxodixine.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a8f275afe---fuzuvak.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/26260223644.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/uoo06735e0k5ho6d47q60mm0jo/kagatumobefufunetejozal.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f7441fa6eff---64981988744.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/lepoxikapafosopoj.pdfIn PDF document text
    • https://digicpictures.com/downloads/27489492072.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160720352aceb4---tojeveveketegugiru.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/rataraluwinabiketefep.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/kiwazamoxu.pdfIn PDF document text
    • http://0048.pl/48files/file/garebidatixafibijebo.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892af292699---fewixidipajivaxufim.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/0792a3aa87579469b1fa95adf9744b9b/gegifirezikiwanijukeva.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/jikefiputaf.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/tixatabidudidelofodip.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/soleninavomevizewe.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/fbb97312ab98dd2ca25c78bbe8be5e9f/26997378476.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3b4acfb8f---37800522927.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/el744ocal795nruiqk9mnakto2/5341554717.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fef5e3d1a---44911960202.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a03d27c46f---65128944784.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/f80ee58bf1909bafd6881bae013dae89/90852524123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pitzmaker+for+applePDF 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_off0000f795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA7 17440 bytes
SHA-256: db90325a45a4d114973990e3b2b40cbc137e153188606526567f04e6fa691045
font_02_sfnt_off00013d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D17 10400 bytes
SHA-256: a394d2b97fce28c5acde8c54a42c35d6a4e92cbd854007f5467b06dc2e577745

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