Malicious PDF — malware analysis report

Static analysis result for SHA-256 832cdfa2cb948455…

MALICIOUS

PDF

80.4 KB Created: 2021-07-04 18:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0990a257de6d854a80d86698141dc340 SHA-1: d920f71a22b7bc2cb876fd3d8b0c2cdae81e16ae SHA-256: 832cdfa2cb948455ab165631717303b47d43a19eade5c0ea33a08c75a3291b28
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The presence of multiple external URIs and a link farm structure suggests an attempt to exploit SEO or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://abnicum.com/files/file/68623475476.pdf In PDF document text
    • http://ahcxdq.com/uploads/file/082018032518.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbd6e62219---32306049019.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/boxitote.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/489388d1206db736246a8e18ede1ddf5/vovidilokizejigefix.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/16970653917.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a517f53348f---75453138661.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/jumuwizufuv.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e046f25b965---42224164507.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/numokaxi.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/1c552426da24ffd292aa857be6480598/tixuburulawubibu.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///majetup.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8bac1ce8f---38510848358.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdbbf0c5c0---zixejal.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092b400c0063---12077874246.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/88103557244.pdfIn PDF document text
    • http://huiking.cn/uploads/file/271223552498.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/86649fe16e33174f8d149099cf6dc365/38657572551.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afbecd3b74---lajininisuzozas.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kegivulal.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074498f65e6e---64443779624.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/jujagasowol.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/xonotetigapexipububis.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d798d1b3e---36620623067.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8861a4f53---leraro.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/27709fdd333b534fa1520d5aa52576dd/vosurizuzev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=oxford+handbook+of+anaesthesia+5th+edition+pdf+free+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_off0000d3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFD 17460 bytes
SHA-256: 76bee851b7b53c17d642d8b834e066c163de96566ed71fd54741f9aae5d60bbe
font_02_sfnt_off000119a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A5 11172 bytes
SHA-256: 9c0e3b9713953022209a7ee71df9e6f13b03c4c9c48d96c611d173402ffcee41