Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa9f404d0c977dc…

MALICIOUS

PDF

81.6 KB Created: 2021-09-01 19:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 58818d02593511b9e723d97c7ec1878d SHA-1: 6d3b320c34418e9059b10b8b7313de6c3efca4e1 SHA-256: 9fa9f404d0c977dc68193fd2cb01d0de259d1d177d47b9ec5ffef6d3e29d28b3
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised WordPress sites, indicating a potential phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/59962450939.pdf In PDF document text
    • http://megalabsrl.it/userfiles/files/ziwizanowaw.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9aca6e5035---76420170965.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/945e59032fb75ef9d249104564d491af/43702859133.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/c16238029239124c2c9fbdfd8693d6da/vikesawamonajupemebere.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d79ac59996c---90837025197.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/ropejafebozenojikanego.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/68540430160.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/090f1857bf5357bad0457862153ece12/21521150527.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/27659951200.pdfIn PDF document text
    • http://technische-dokumentation-hoffmann.com/upload/files/dogesokudepubivemolejulez.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/81005636117.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/613a5292277c130f4aa49effd3bc2c48/xaxapirazagosuxopo.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/hcrrb4qvln53dl53ulvqv2302r/64035310213.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/37688720124.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/58819296842.pdfIn PDF document text
    • https://mkart.it/uploads/file/dutobuziramisutarozin.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/nobupisepegizagagiz.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078242964b52---kupopidikaruxurew.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/38076320268.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/54022149939.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/zoziberorudemezisowote.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c57c28a26---88762209913.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/90762766291.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/4c39c38783b69088962b7d03d8334b9f/nuzegaronebuvafori.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c42c08d848---danan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=dirty+blonde+to+brunette+hairPDF 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_off0000dda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA9 16376 bytes
SHA-256: dd1ce551e039112d39d723c9e46d6d3b1198d57adb12138003f96665fd5abd69
font_01_sfnt_off00010754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6B 10532 bytes
SHA-256: ad5896801cc9ff4147df49c72ded05093bc8a1a081601cdc99fdcf5c97b18811