Malicious PDF — malware analysis report

Static analysis result for SHA-256 f04e693e2700a473…

MALICIOUS

PDF

78.2 KB Created: 2021-09-25 00:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: da43727abac5fe78eae2f4b8476b76cb SHA-1: e44c8d4420eab48c690933c53bfa7588492e6049 SHA-256: f04e693e2700a473b11fceecc9d3fa1a89b3165e047d551f49dbc6883fe0a466
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised CMS upload directories or are structured as link farms on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://hgbs.de/userfiles/file/fedinufosegexixov.pdf In PDF document text
    • http://www.ezmoving.com/file/78438670314.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/59088474931.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb0b2a2b8c---dujuvazo.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/94661949061.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/67125777670.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/89612881167.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/tabitorulaxerutufaveves.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/pukulajojetapofakumil.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/dosexanagakanitipazuluvog.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/71257207089.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/82906545899.pdfIn PDF document text
    • http://cheapstandard.com/uploads/files/rumixizufawoxigiwot.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/893b45ea6bb1044c4242f0440e7601c4/3870569384.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/60910213275.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/92792922714.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/tetixaxabatevatej.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/21809344934.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210920022538.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/18543720400.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/10890212481.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16140e748e0cf2---14874131907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=truecaller+old+version+2020PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15A 17828 bytes
SHA-256: 92faa76cb596ca543ae52b2881dad89a50c4bd957e460ce16af8876c4cb6e6b7
font_01_sfnt_off0000cd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE564 17464 bytes
SHA-256: 533e914118e4dd36a455c43643e74e65e5a3ba54fa73f707166bc6b03a0c200a
font_03_sfnt_off00011253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11253 10636 bytes
SHA-256: 1f09b681776150112bf628d97ccd475772cc01ad906967ea52e53552b71ff0df

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