Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c041fcf205a4b0…

MALICIOUS

PDF

86.2 KB Created: 2021-09-13 14:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dfef8130365832bc513f5f3370750041 SHA-1: edc08a3686d2ff8e070ef99c356ad01f16e4fa53 SHA-256: 84c041fcf205a4b0a11c1b3b44c6dc13149d3d14c07d3f8b451285279ac5b400
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the classification of this file as a malicious link farm.

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 https://chcial.ru/uplcv?utm_term=candy+crush+hack+apk PDF link annotation
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/velorixodij.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/82736408445.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/wewaruzi.pdfIn PDF document text
    • https://slotpt2.com/contents/files/vawaraxewatunobamoniroliz.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/xubodejorewawo.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/nawufawuram.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/11995987618.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/tajati.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/ziguzojotekedoseduf.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210901195714.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/22340369206.pdfIn PDF document text
    • https://pellevah.com/upload/files/8182931844.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/4052774320.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388f554ddb1---61277791772.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/tigufe.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/15422129432.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210907_3B15D8F8CEA500DF.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/mixogopiwuvusumoxibetagep.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109040507165497.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/9cb882aa20de9aa7d772e4b0d50008ce/bometitixuxino.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/mefagewuj.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/garat.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccec852cd7---tomomeneraridajojupajo.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d8ec0eb39---xolasoranolopadususubunuv.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/70690947704.pdfIn PDF document text
    • https://unosms.us/userfiles/file/17219944597.pdfIn PDF document text
    • 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_off0000e168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE168 10460 bytes
SHA-256: 4fa025cb6419fe7dea93f6251c3d2197065db3eea17f88164be7ab767375a81d
font_01_sfnt_off0000f91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001112f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112F 23060 bytes
SHA-256: c8339b59948bb90cfe608b29699cd99bc670b4e0fee8d6a9ad70c011948e2fa3

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