Malicious PDF — malware analysis report

Static analysis result for SHA-256 c692e900d40d4c4d…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 07:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b8378101f2a640a138a63fa7c2c6e87d SHA-1: 65669076deb5e3d8099cc05f160bbb309294cbca SHA-256: c692e900d40d4c4d5240027042599a950078e51fc4e8ca628c2f42e707131289
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites. The file's structure and URL distribution align with a malicious link farm used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://wojno-stal.pl/pliki/file/lapoki.pdf In PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b891a7da24---sopisatewejol.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607a40993175c---44923049694.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/a4323e82a32523fb7d2f3dff624b8d7a/2807078369.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/lekirumitesusebiwi.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/c25161f819ff611613eca2e6f0d2238d/sozisamunirixo.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/dinimabixupotapenaxominaz.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/nabafelinaw.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/nugeriv.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff582c4c45---rejudibo.pdfIn PDF document text
    • https://ovalpolycoats.com/media/biresexulutatipare.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f05fd8346e---40252203526.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b42e986a4d2---71413752766.pdfIn PDF document text
    • https://ebooksweb.net/files/file/wisomekuxe.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/53800207119.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/cc39dea64fda60c2590483e13a3db95f/xopuvefebamunud.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f1ce85f1886---52525129189.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/80188940846.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/35209760661.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/47421763405.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/79ece9871719380ed48a403e19e630ad/65143375845.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/7hle0hupm5i8j3sfk4bqqjig76/fetazeja.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078646110575---74977728885.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceeb9a4964---tutevuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bowflex+dumbbells+exercises+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF897 10900 bytes
SHA-256: 83130b35ec9790eb24c2aefa5c69ed3685a207f7f82becce45e8991e69cdedd7
font_02_sfnt_off000111ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AD 17852 bytes
SHA-256: 3389d99b25a426eb2b8a8fd271bacf852e8175b862cf37deb7a332a0614c6857

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