Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a389b2fcbb11f4…

MALICIOUS

PDF

93.2 KB Created: 2021-09-07 08:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 073de7238141a34efb545f9aa491af2a SHA-1: 2324b9854d56f73e7745f01784575ed5248f1be3 SHA-256: c8a389b2fcbb11f4b410f86785cd16b78994c08bb65963d6979c60b6cb068f1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/uplcv?utm_term=etanol+96+adalah+pdf PDF link annotation
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/taledobikapuwuxalulule.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/pevefisej.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a837a88ca83---46812466937.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/j65plbqke51c861thunql6epf4/zalemugupesezo.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/23c047c8903dbecf9295498e6a0fce02/20112344267.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3fbb04f7ed---52535507861.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/51159328597.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/tofataxibobesewa.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/659690a188c04b4d09303d55853f4055/fudutemegewadipogidi.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f7f55328ef---35262085375.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/bajirubumetofo.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/47386352972.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1jhuu1vcv53a67ii4ir0ejle08/36501920367.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/61771443961.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/mogusasoboteposa.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a78e8f03---17517544609.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/karuminavixedejiwi.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/supazosixogalizoxotoligez.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/kizetovupebizosukuse.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/wezokolunagu.pdfIn PDF document text
    • http://roleco.pl/data/aktualnosci_imgs/file/taxeledoda.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/51039978728.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/0886b14abb57f63b26922aa6169d16f0/77471429655.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/dixoximiterajunotalo.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/21036978217.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/legigib.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/wenisufigokisezunikefevaf.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_off00010748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10748 10424 bytes
SHA-256: 321915c828575bec7d15dbe35e906895f09a99e2f9656d5944db33f7f6e226bc
font_01_sfnt_off00011ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC2 18016 bytes
SHA-256: 414355364acb05681fbe48d89f15fd8ebe48f75117bcd87507cb66d01d919e0c
font_02_sfnt_off00014e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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