Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b7edf90ed02bc3…

MALICIOUS

PDF

83.7 KB Created: 2021-08-04 11:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0fecb7fa2c8f4ba847260f30ec61c0a2 SHA-1: 42f9204d8e671bd90095e6ca0067f666cb092527 SHA-256: d2b7edf90ed02bc34cb7efcea86c46c157e1fd3f2449e462b133ad030dd1c60d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to distribute further malicious content. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifying the pattern of using disposable hosting for a large number of links. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/2db9fb0e2c026f152db11f9edab61ac2/89318780104.pdf In PDF document text
    • http://newdimension.su/userfiles/file/savonaxotagurojekowus.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c779d8ce28c---51300551135.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/76085133989.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/78076598409.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b249bc063df---wopexu.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607815aba7cb4---87883635354.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/39077752193.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608808631bcb8---tisonile.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/581785e45078ba512da97a3f28531a2a/zemolunizaporix.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b5dfb5313---15623307956.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/57024688410.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/46a95bc6abb77553d1b3ed58b8b8c72f/nagunutezupidede.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/xakenumuv.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/rodubagafun.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/vijefakojoxetojenig.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/78360195923.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/861136820.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/bagegiwusujuno.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/zozivitekinomapibuzikipu.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/202c960e5dc06a08088fd0b18493cc6b/folizixu.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/7149411986.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/wunuzilotuvilokubebus.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/af678e1facd3cabdeeb1a6fa435caeff/rapetezivotasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=australian+english+grammar+book+pdf+in+hindiPDF 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_off0000e1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B0 17344 bytes
SHA-256: 9fe0b79efba5c223b5e13666066160b2260264931ae95d6873a0a4b7f042e0b3
font_01_sfnt_off00010f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12723 11256 bytes
SHA-256: bee1cc751abf071d615f97a8988f22fc3b0a175e28bcf21ecaf22b41a1398a39

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