Malicious PDF — malware analysis report

Static analysis result for SHA-256 64dd069ea894e52f…

MALICIOUS

PDF

83.6 KB Created: 2021-09-15 10:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef12e166528a1270961cb0c40da76629 SHA-1: 10cfd153846558fb3881e35aa25b8980b187730a SHA-256: 64dd069ea894e52f208f2e4f76b356db9783f1a46f39bcfdf006f63f13b096be
204 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains. The presence of a visual download button and the ML classifier's high confidence score, combined with ClamAV's detection of 'Pdf.Phishing.Trojan', strongly indicate a malicious intent to deliver a payload. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161359045bb5fe---xawafomo.pdf In PDF document text
    • https://theptaynam.vn/upload/files/duwinamataw.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/vuzemupobaj.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/kuwusupafo.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/dilubo.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jobawubuxenazukusumeno.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/62049269794.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136477e71b8e---wibimu.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72495849198.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/029bcdc463a83b617f45ff7733ed6867/96473464420.pdfIn PDF document text
    • http://mfcpavpos.ru/file/59818033457.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/rawogowoxonojekotusugajo.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/62894222499.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/32896062127.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/61639826604.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/zigox.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/tolowulirakirigepotunanos.pdfIn PDF document text
    • http://okvin.org/userfiles/file/zurawumafafapararojama.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/fasadimazilatifatugu.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/44375894435.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/71679974723.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/89593786432.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/zatosudaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+backup+whatsapp+messages+iphonePDF 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_off0000e105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE105 11084 bytes
SHA-256: 6ec8fa64681fdf49a5ff0b9153fc5d59c6ccfd325139520a8ac1a3a2cf6643e8
font_01_sfnt_off0000fa89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA89 17996 bytes
SHA-256: ca4fe7df7286358e3841693860f4ba494627b156a08857ac0b345b07776422d4
font_02_sfnt_off00012867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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