Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b718dcabacd0cb…

MALICIOUS

PDF

88.1 KB Created: 2021-08-15 09:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 47164d0a6c86c044406dd3eb12dfabc4 SHA-1: 7eb52980b92f7f0b842b9de536607af8c5315464 SHA-256: f0b718dcabacd0cb1d43c7ee51d1d0615977a0e38f43acd476f30fc82b118a38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous other PDF files hosted on various domains, several of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and contains no readable text, providing no additional context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://rowadalbyt.com/userfiles/files/64598048965.pdf In PDF document text
    • http://hmconcretemixingplant.ru/d/files/tibagawigotulurajibizivir.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/79181518402.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/zopadoronikabegajadaweg.pdfIn PDF document text
    • http://faradbox.pl/files/file/32552292178.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/18237413541.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/88397733483.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/50306693749.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/6927255727.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7c2b60d1---disekazox.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/buzewisegemunijalax.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/pepenazedozelutevipovov.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5d0a8d7a9---tinuwugaruzilulufefuza.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/jusigex.pdfIn PDF document text
    • http://markone-tools.com/upload/files/11298923460.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/78dd25a2d2c623a6cea6c2a19225c54f/webiginukemujarerena.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec074f068b---gofivituzu.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863e7d63bd6---mafojuwakewiwezevivabuv.pdfIn PDF document text
    • http://furniture83.com/upload/files/87809074867.pdfIn PDF document text
    • http://learningkey.org/userfiles/tasujafigu.pdfIn PDF document text
    • https://edgecs.com/documents/72253870733.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/17269749527.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/hvvkqnoj20p4m43j2h32a6l70p/4351819403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=shaders+para+minecraft+pe+1.16+iosPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e69f2faddb0a005fddbc42da26b03c2c/89499068770.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EC 11200 bytes
SHA-256: 06fb8b5b70e16c9a718d2e92f3dc8a01ff08dc440ecee20bd407f5ec17257cd0
font_02_sfnt_off00010ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF7 16384 bytes
SHA-256: 6bc4420bbfa61156f096b6f0725168f8601d7500e332933a6f3144c23c09a2fe
font_03_sfnt_off0001253d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253D 17348 bytes
SHA-256: 90779fa6abb1218b7b1f83a657653a354ef3868e8f803f02786956861e2b7b88

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