Malicious PDF — malware analysis report

Static analysis result for SHA-256 56cac70bea7d9f18…

MALICIOUS

PDF

68.3 KB Created: 2021-09-12 15:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: baa924c997613dca1d882c212645403a SHA-1: b02f164d4d7ccf9dd2d8d3b54242f86a85eef12e SHA-256: 56cac70bea7d9f186d84b4b4576450585630c0f45387be069b0de0cc4033bd77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613402db1f34d---26926360648.pdf In PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/2c004eab1d93367ceada21d75b91ce93/legosevalusifopo.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/86027642397.pdfIn PDF document text
    • http://uco-kampen.com/media/files/85109103339.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/zeriw.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///zovivuk.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/26167348632.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/2689525414.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/17330881564.pdfIn PDF document text
    • http://northcity.rs/slike/files/61335927700.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96318561401.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16134368eece94---28583383908.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/tebasalod.pdfIn PDF document text
    • https://bfull.ru/uploads/files/duvufeponuniwuwatotunak.pdfIn PDF document text
    • http://www.toptehnik.si/images/wokefubikise.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/96600949729.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/aaee1cba5a65dd610886f8cd213880b9/jolalo.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6137b2dfd2904.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/sanalo.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210912_A16EF6F8F23B459D.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/lekasipiviwupen.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613728ebeba69---milumuterivulat.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/didibepuputulipaxilurowe.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/59ff4ef75bc0ab8da83662699772f62f/2333695649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=website2+apk+builderPDF 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_off0000af81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF81 10608 bytes
SHA-256: 9abdcac80d34cf40c47e53344ea7b191b5aa05ecede4555bc89ed18878259515
font_01_sfnt_off0000c7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BA 14556 bytes
SHA-256: da15cd84fd1f1bdeb1f9175e2668d7f9cf1e7b883377a89bf4fe1313d4155539
font_02_sfnt_off0000ebeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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