Malicious PDF — malware analysis report

Static analysis result for SHA-256 79db81074cd5531d…

MALICIOUS

PDF

76.2 KB Created: 2021-09-19 01:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e23ad78a58c9d28717f23c2d2e6d0454 SHA-1: 15b2b1d96981761322a31b8502215d738b4c743e SHA-256: 79db81074cd5531ddff337856818cc94a3dffb2b187d2a377c8e30f0ae704349
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm directing to multiple external URLs, some hosted on compromised CMS platforms and disposable domains, indicating a likely phishing or malware distribution attempt. No scripts were extracted, but the structure and URL patterns suggest exploitation of PDF vulnerabilities or social engineering to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://daindnc.com/fckeditor/userfiles/file/89643962832.pdf In PDF document text
    • https://rais.bg/uploads/file/89219042031.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/86480859684.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/13281852691.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/ziporovusani.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/6e8c7a7273983fb891c3b2cc112a2658/kuravurikoraxorog.pdfIn PDF document text
    • https://amgaa.org/temp/files/39998719532.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/8h6qiovrql61nluf6epk4ma4ul/foparesizap.pdfIn PDF document text
    • http://cjatkinson.com/userimages/zabakepowujubogarowuj.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/denusugo.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109151452045623.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/xipixejuvu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16141f72239e6a---32693665086.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fd63adfbd---39381167534.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/dudusedonujoxebe.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161429b2d87b97---vematixinisolemobazomo.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/44044895107.pdfIn PDF document text
    • https://12tiga.com/contents/files/70656434079.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcd323b5c3---tazerasawexiki.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/31305116522.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/mg0uva68j4avnr862vktbc799u/74927360975.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/vuxuxanetawuxejaretim.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dde1ac3a5d---nasobipotanerinob.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/14908601611.pdfIn PDF document text
    • https://salonrewards.ca/images/file/45857554410.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/pitetawidifejutisajag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=probabilidad+y+estadistica+mc+graw+hill+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_off0000c4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F8 11304 bytes
SHA-256: 9e74e61b575b9d0b142ae3edcf52b7005cff33546ef9bee9e4f5a70effd230ab
font_01_sfnt_off0000df29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF29 16824 bytes
SHA-256: 4abfd246e77e5560cfedc532ca40ceb724596a0c667057b185cdf2a5bce763b9
font_02_sfnt_off00010a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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