Malicious PDF — malware analysis report

Static analysis result for SHA-256 7741accf692b57ea…

MALICIOUS

PDF

89.1 KB Created: 2021-09-20 15:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 65f1ce649f1f9ff66d9791fbaeca1d0f SHA-1: aaef1fcf562c0e1f2c78ccca203347c6be9bb538 SHA-256: 7741accf692b57ea395ea4798e16797d9b0285a2368b4f4a666d82daf7867628
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to potentially malicious sites, with one URL specifically mentioning 'english tenses book pdf' as a lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=english+tenses+book+pdf PDF link annotation
    • http://xingyeknitting.com/userfiles/files/14046030878.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/pufuguxob.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/dazukeweniwokinisuzuwos.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/60091396340.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/26654265376.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/31741494546.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/55664426952.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/74021066227.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/zowonexen.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/32994058079.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/97714240485.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/28390791158.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/79891002449.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/gorifikowelo.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/koniviriro.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/9297194456.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/91028638771.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/pakewotugavadakibafaxanev.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/tazusubozupitus.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/72089874839.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613aae5968980---81989376872.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210915184328.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b82c7bf42---32207981806.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6c0592035---xibojekavubinub.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_off0000f605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1C 10728 bytes
SHA-256: 8ffca846dc999777de25ecb27f39f4a204729045cdc0310e9e2b4d2700a0a1fb
font_02_sfnt_off0001262a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262A 18692 bytes
SHA-256: f233fa8e7b89c19a0ac056f14a2b14a37815812e582d035bb88cc193038f8d24

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