Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca643b9cd747edc6…

MALICIOUS

PDF

117.1 KB Created: 2021-09-04 17:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cef1e7995e3cbc53bf152abced651e38 SHA-1: 597a8a0f91bbaefd8b2f09b4bfa66b999ff58713 SHA-256: ca643b9cd747edc662abc1db65a168c11a72ffcca469d2948323062da4058855
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point to a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=talumpati+sa+kahirapan+pdf PDF link annotation
    • http://inannamsao.com/uploads/files/95432222684.pdfIn PDF document text
    • http://retailcop.ca/files/39275030982.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717de7c06dc---83167290806.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/4db86529cb857089ccbb503d2fd58fe5/54753990184.pdfIn PDF document text
    • https://hoongnau.com/upload/files/73409806486.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/gurob.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a0034ea711b---83973622602.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/dd7d5b96901f2b5168b8b8973fb1a524/kizaz.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/62283514747.pdfIn PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/bafodimuzupiwiredewavije.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a61c0a316be---2971583210.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fegidijijevasopigemizu.pdfIn PDF document text
    • http://tort-art.ru/userfiles/file/93606082341.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/93476624654.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/a192814ccae4db41ecbf11cef1d00711/12880871088.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086acd0ad738---34994088251.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/90863573215.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/negewupotudo.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/nusipilulejedikalerivi.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4efd17f104---regododixi.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f961058d5---wozodozevuxalilodeda.pdfIn PDF document text
    • https://ms01bet.com/contents//files/84372565071.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/4392dde3a20b47ae35bbf23aeebab0dd/95478238559.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/gutipikosexalagukegob.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/14658247200.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_off0001681b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1681B 17888 bytes
SHA-256: 5d4ed16da918f1e83be5fc6d00b953b58a94d84aecc6131e761cd6f15dfce508
font_01_sfnt_off00019612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19612 10664 bytes
SHA-256: 85d935cb3e1c5d43a50cdb879a2964cccf2126a8fc0a83db20f76b1945912682
font_02_sfnt_off0001ae40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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