Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85a263d81e09f03…

MALICIOUS

PDF

83.3 KB Created: 2021-09-05 19:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a6d8bc815b1fd7eb089bbf018e2573cb SHA-1: cf07801dfe980e566236c0aec0f171120c2cf9f9 SHA-256: b85a263d81e09f03227f7193694919d8907d8ced6735974c717abf0906e2d23d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://archism.ru/uplcv?utm_term=manajemen+diklat+pdf PDF link annotation
    • https://marwaservicecenter.com/nbloom/fckuploads/file/nurifesotutato.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/a7a86dccdf80c4a04cd5b487f916ab91/58199742263.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/vuwuwogutumepep.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2259af1c7c---80013881671.pdfIn PDF document text
    • https://sbufficio.it/file/61961940163.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998d7c6b4ad---94150824280.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9821fd076c---30900129841.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/27400393165.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aec56261eb5---96536043365.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1612bf4141427e---jewojebewi.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/senolozutiwewiraxeretej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb1dcc0522---judawu.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/gozegulipodedida.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/5429266206.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/21f472c1175b2e65c7c6511508f01c9b/fosalaxomuki.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/49468280982.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/cledjmkjcvo4l9m1vi0fa573nk/toselixifomudagajinupo.pdfIn PDF document text
    • http://alkanboya.com/files/file///wuvikov.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b170514976f---popitunokagopelis.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021061905064042.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/1ajkbrfsresmqe89eo4hn2k5i7/31982094997.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071589062ef8---muvowuriwojurik.pdfIn PDF document text
    • https://arerp.kr/data/file///pakiletubigavufexap.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/985d6ee7e1ae03fdaa0270daf29e68b0/48517214599.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_off0000e332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 16952 bytes
SHA-256: a87c40999436c002ff0cc046715d898152d3d6a8ebe341d58174b5c66fb37483
font_02_sfnt_off000127e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E8 10484 bytes
SHA-256: 184cadb8d22476a5afdd0102e304d49436e0095cc6a9aae392b9b24849aab343

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