Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b1398c3527aad6…

MALICIOUS

PDF

89.0 KB Created: 2021-09-04 10:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4d4c3d106153d5e9d6ba6633aa546252 SHA-1: 370c9133449755b167a432202825a2b1e1394982 SHA-256: a9b1398c3527aad64ba19143f8d5d21a555785277a07ae2e80e9ea35c90778d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/vk8gh353ic9e7rnnptp6ijsr33/12358194463.pdf In PDF document text
    • https://oteaexpert.fr/cite_imgs/file/movunodabazixupidawep.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/japunudidoma.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/xabokipad.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/83136357882.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/8d854ca7aec38e684a03953021e82baf/49347571089.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e542a23b1fa---21269295668.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/808bbfd6623dfaafce2658b3526f83c6/vakexisirekoneduzapuxe.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/90029082971.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608045af9ddc6---55166477673.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/jidlnc5j7m2i16s745104es3n8/dejir.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/4725ca24e0cb402f5ee2604b3fa9a94a/98613843919.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/xifusujuzamozafubu.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/lovozelobinalaronijaxab.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/78831520522.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812223252e2---temos.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161163c4562789---jomidesofizupon.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/zalitisasowobi.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/xelixumi.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16077013585a99---segufinotojinobom.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/gasadekojumifagowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sat+essay+writing+strategies+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001109f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109F 10784 bytes
SHA-256: ded457f701ec24a7bac9dc35185e6345071bd413290131770d4c3dc97d3819fe
font_02_sfnt_off0001296c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296C 17280 bytes
SHA-256: deccd2bc32cffa8f5db34fae6a57257b339a87c57f3d985e247f731a3b968c89

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