Malicious PDF — malware analysis report

Static analysis result for SHA-256 7def414bcb93c6c3…

MALICIOUS

PDF

71.2 KB Created: 2021-09-05 22:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0bdfebb8fbd96d48c574e71a823aa31c SHA-1: 320270cc2a2e81b8677a18e324257f9b4b17e4f2 SHA-256: 7def414bcb93c6c36761d79973011336787e48e37815f733b89fb6220b2c4171
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content or phish users. The presence of external URIs and a link farm indicates a likely spearphishing attachment used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c9b2239e7---19251206353.pdf In PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/f35h136eoj67cus6on3nlfo251/vemesakovuraxatef.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e53f607a74eed94341110827901954ac/rogirusosipadubawafepe.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f30caa5e9a---94252251570.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0236446d6---tifanomoj.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161090f868f096---31274884009.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/83568590464.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b7148c07d72d0be56bc385f33ef79030/98535887132.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/xosakonekaguxojut.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/wabevimudixodamewov.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/pelizikumawunoxobo.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/50541767019.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dadcbecdc91---gamisali.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/puxemasu.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28b4c4f7a---zumifefinakerusepuvopodi.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210501195051.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/25679480132.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/27188623364.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/numotunu.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/1476385835.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f82277e87708bba811088efac1338ec9/daragobexiv.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/nukupokavunupelonesu.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/mh5p7id742eakgtdhne9oe9257/60213914417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=novel+janshen+risa+saraswati+pdf+downloadPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808c62ce71a---lofiti.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_off0000b29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB4 10852 bytes
SHA-256: 136da68d05b79fcdd3ebedd18dc6656c6b5576d89da786e1b8d18e39ace679f8
font_02_sfnt_off0000e3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C0 17844 bytes
SHA-256: f5256401196533012cd15777df8b6d4a1cab12cc4f88166702c55e11ef1f79fa

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