Malicious PDF — malware analysis report

Static analysis result for SHA-256 f363a4862ccd876b…

MALICIOUS

PDF

88.6 KB Created: 2021-09-05 00:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b7b377e3e07f021bd1fffb4a9ad64a98 SHA-1: f7b1e71e7eb19357db22450522b7d68d856bb173 SHA-256: f363a4862ccd876bf41818bae7cffd47a00a72a36ef73176ba263cf0cb918990
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, which is a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggests it is designed to lure users into clicking malicious links, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://s-privod.ru/userfiles/file/72450384995.pdf In PDF document text
    • https://aashianarealty.com/file/52291544321.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/kemixusororufabodupiz.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/dafd79b6200ceae06b738fec01809eb5/wasujulavilefuxaxixi.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/defanimutegigijukumud.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c407d549d---51134713011.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80f4cd007e---sudifenere.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/21b4fdf1436e7b51c9587c7b412986da/lajotibanawufivov.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd42b41c03---53947900858.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/44215860118.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/jejero.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107fca3d2f87---97079222165.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/ht2ancfddmiu7vmbnqefk0bmm4/roxigejowosabesus.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607398d4cb4c8---nivijejumudulo.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/47575526112.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc88469331f---wezamewubipekuzofubeledat.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f83360ef65c---debegolaxuvapedekuta.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/6e0ad1a0fb9c35afec14ab55064a0d12/90031818730.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0fossd06s201h7k1k09h1ep5q4/40075272116.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/16281376207.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945d0e9e634---83421045092.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/medidodipowowopadofi.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16092501fb56ca---37082163115.pdfIn PDF document text
    • http://bscartridge.com/pic/60682347687.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/xuzovutevematanob.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/38541215275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=matriz+bcg+de+una+empresa+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_off0000ecec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10503 11088 bytes
SHA-256: ce8513a60c4a2989b9e1a723dc13844654eccfdec1492ecd3541e4a74b8ca54b
font_02_sfnt_off00011e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7C 21344 bytes
SHA-256: d08ade81c63e13523e658acc031e76d4664e3c8a618c176e3f5134a6ddf66ad2

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