Malicious PDF — malware analysis report

Static analysis result for SHA-256 cafdfd23f897b0d1…

MALICIOUS

PDF

76.8 KB Created: 2021-09-18 09:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7abc208bd9a597b219054d0ea7ff9d53 SHA-1: 9b8f6b5efea281c69ad9f063e44b967ebac78220 SHA-256: cafdfd23f897b0d1f117a1accfac8433cf94a4f1ee9656f6fb63eecce31918cc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm and external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pattern, suggesting the document's purpose is to trick the user into calling a fraudulent number. No scripts were extracted, but the PDF structure itself facilitates the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=play+store+for+laptop+windows+10 PDF link annotation
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613281fcdbc96---13235234581.pdfIn PDF document text
    • http://serting.eu/userfiles/files/57943108146.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/38437077846.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021916045325291.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///binobawajijeguzubegu.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/24726852854.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/keripanigofopivenokeweni.pdfIn PDF document text
    • http://strandedtattoo.com/file/78991569986.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/50275250532.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/jomiduwisa.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/419060379.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/62003480279.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/dujepikalijukit.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/pomigoguti.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/82476189324.pdfIn PDF document text
    • http://abpaluso.com/upload/file/3680810153.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/431o53ssod3imoqa3vsjp86u4m/34865240435.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec82f636ff5cd310d73fc6ffc2c2eb27/kenodava.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/25322849667.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/85457318102.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/pinagudoxewepojizinuvun.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db922aa88a---koxagizojetelute.pdfIn PDF document text
    • http://seamacros.com/upload/file/27780138150.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/naledudagixatuf.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/47881260355.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/sodsr6deags28csor8qbt4ledo/58023811861.pdfIn PDF document text
    • 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_off0000c806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE018 17092 bytes
SHA-256: 3ba1f0c83fef3c0c30ee20b8a91af521e50078dab1d1df98657640f4ad5d9254
font_02_sfnt_off00010c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C56 10864 bytes
SHA-256: 97892d2ce696329ced9a24bdd1de739f2fae3caea1fb5831a811ceb7dcf8f443

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