Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d9164f7fffedc2…

MALICIOUS

PDF

84.4 KB Created: 2021-09-12 16:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a3c3d2896b63295596750c1dcf048bfe SHA-1: 561b2e8f19ed0c7b4353a8eda6aad7cf8c2cc483 SHA-256: 17d9164f7fffedc2256e83513e899e6bade11a353f404295941e557a03c83409
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting domains. These links likely serve as a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d0b2c8d8---66098377929.pdf In PDF document text
    • http://homeloanz.net/images/e/file/sijaropan.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/90651663768.pdfIn PDF document text
    • http://stromzeleny.cz/file/fopazoleje.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/papubawokavujuvivedeb.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ee50d1d76---81866032358.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/muvotigut.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613246a0a57cc---77744749304.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/bumiwepusabobeluk.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/68307349115.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/fusezuboluwopaladeweweti.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/gunorutavafutavevinaraku.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210902_075650_5357.pdfIn PDF document text
    • http://ibb-online.ru/f/file/tibogonugewuwafox.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/1aaa6800848c8627032fe2edce80deb9/82479150704.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/2191472662.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/fegazakijabobeb.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/zokufaz.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161396b71dc151---79476534633.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/lejisaluwalojipiwejuzifo.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/bozuxipivepenarozux.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/sigupamudituteweb.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/linopavob.pdfIn PDF document text
    • http://llux.vn/uploads/files/jadekasojudunobewawovo.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210910_154624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=stube+app+downloadPDF 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_off0000e644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE644 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE56 18096 bytes
SHA-256: 2f35f4c2746d5d6b508f497df4f4182745861b5c9066bb6c28a45ca602f9cc63
font_02_sfnt_off00012ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA9 10428 bytes
SHA-256: b30d8d9dd176099f85d7aa264e90bd09c81b31f3d63f4c58d7483455ae2b14c5