Malicious PDF — malware analysis report

Static analysis result for SHA-256 88dd532a035d4d66…

MALICIOUS

PDF

103.2 KB Created: 2021-06-28 20:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 32ccd96502ff3d79e4218bfa660cf24c SHA-1: f778669e83823b1f89dc317c885d00481835ec7f SHA-256: 88dd532a035d4d66f22235ee17cd759cd88bf029e716837dea30bf24a7b93baf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to external resources, many of which point to compromised WordPress installations or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the presence of numerous suspicious URLs suggests the primary attack vector is directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/94626416835.pdf In PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/d61b917802dd0f54c4cb36a122ae33c0/73390793221.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/rajaxuzuravov.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/26732e0555bb4bc999dc5cd721e8e217/vusinosuwifitarenafek.pdfIn PDF document text
    • http://nfc.soo.jp/file/mupuvavu.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/kekikonow.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/b1f395de56bc5a50fda0ae1e269104aa/tozekatol.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802fe473c03---5538103321.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b843b32c1---bubekufalexevopitubodag.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/borinovikoxuf.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/7fb3dc356e920860e0a217c1474a0d94/nufenejiler.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/77129181233.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607869ee2f750---47926519503.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/1e10e28da4e55eeab6a1e415acaecfcf/bapanudezizekigam.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770a1a9d2a0---31372950010.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/kudag.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/6e14cbbd2e829f2c410c87a9ad6143d1/kifigujiva.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/b3a87c3e08eef1968837e29318864b9d/budilezafagi.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc30c1a596---74992182038.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1181e974---24483776948.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/40400716577.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/57630958175.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/rlg48fgkng3ao655k08m8dbjf5/8917677080.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/974124e417ceab88909f567557746c59/lenubinisaj.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/lunokelobosikufapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=chapter+5+integumentary+systemPDF 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_off000130d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D4 10912 bytes
SHA-256: 3d165b4abcb047ea905c3a823d5c205d1d52b4f30270381253d8ebdab197314a
font_01_sfnt_off00014a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A00 17352 bytes
SHA-256: 41370929f7ffff9337f61b5ccfc78f19dfd81ef2ca867ac63b0720f0408bd8e2
font_02_sfnt_off00017750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17750 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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