Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c5fd6198df63fe…

MALICIOUS

PDF

78.1 KB Created: 2021-08-22 02:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e425b329dd3c3c3ea60eeba0f21bd1d3 SHA-1: 677169b2455fc1ab1940450ae911039448636bc5 SHA-256: 13c5fd6198df63fecc699bd2e76b1160e24d1c71b635a2c8a7fe6496be26ebb7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristic analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to distribute further malicious content or phish for user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/1rh8eoq3mrj004e2cc92j3vbnu/51813284904.pdf In PDF document text
    • http://swaminarayangm.org/userfiles/file/11685674936.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/jalonea4k5iu9v96mm3ufimat6/futojagotizus.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/tisukotepexuvewulixa.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/a355c2720883a39fd1e459b78db835d9/dedopepuwimen.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/16061983197.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/95cd3588c43b814137178945b86f1c6e/gidadujemolekazapex.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/mojurojeboj.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/29742030909.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/luvumixazido.pdfIn PDF document text
    • http://exosushi.com/uploads/files/44660987008.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a52669d5afe---rikifenolibevanimixo.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/tuzazewudo.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/vogifokitenabomemid.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/86057137cdd9a6cbf324e1b598d3fa41/92351216276.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/7d18de25117c5220f3909d9b9a181ff6/gotavulezimulonuxe.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160808636b4314---saxilesanawodemab.pdfIn PDF document text
    • http://omg.su/upload/File/nesojovizerobafupemino.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/533d646432190e098695814476a36907/mepowigenekuzamuvawi.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d405ac2642---mumezewif.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/v2ptio733dkqtnojt5iaeh646a/53830114528.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/7dpo99p8frej05aubm66djhnh6/31018740515.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/misakexonurafipuko.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/f85985ad7c53615916f0f824cdd3167b/puvipazikojopof.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/750663dca8b12bde0de4e79d0a8cd5f5/40403131289.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/duriwaruzekepikojuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=diccionario+biblico+griego+espa%C3%B1ol+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_off0000cbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C6 17268 bytes
SHA-256: 555046389ce7a3ef52668aaa19e55fdf8b43f85defdaa47bb301388c09a412f9
font_02_sfnt_off00010fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB9 11044 bytes
SHA-256: 0fb087f188def85ba7b974cf31539c98f5077b9fca23bb669e704d7d63201847