Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bdcf8a4dd14e1d7…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 17:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 32384d15c177a68201a8e7591999ced3 SHA-1: d49a5a853a6d47bb23d6764605a9d4fb9fd9fe39 SHA-256: 3bdcf8a4dd14e1d7769dae82a93baa8e8dfe82c1922b7b116b0615d848a12da5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, a common tactic for phishing or scam lures. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to deliver a malicious payload or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://muacash.com/webroot/img/files/kitimunifewumelonefetix.pdf In PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/89488207868.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/xirujirajigogokapovi.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/47270586815.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210908222157176.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/1697112577.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/67243191857.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/45552025914.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613604dd77ead---7145149575.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/98771397878.pdfIn PDF document text
    • http://saint-party.com/media/file/33631771476.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140b91928582---wemonuzizevovipilamozu.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411d512cb1a---nufilowuzusenubitox.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210908180526.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dda23a6ecb---78421807240.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/10934163073.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/18747376182.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/negegezukivojadesabegaf.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tamaxanabidiremibakire.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/2cb5d9f25da78efde7b920e792b2f078/modom.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/010549452314.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb48398944---xumidawalarakifibawijux.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/xarezogunemitukoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=free+fire+video+download+appPDF 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_off0000da34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA34 17980 bytes
SHA-256: 29c76e86950a167da9734f0c4c204cc59c3b1bc4b36477d67e346afdcff58dfa
font_01_sfnt_off00010807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10807 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001201e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201E 10352 bytes
SHA-256: d3b5ed0007352984e1346aff80957c29450bf9b64fc32d899f1173f0a02051a1

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