Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e1c213e78345e6…

MALICIOUS

PDF

83.2 KB Created: 2021-07-17 04:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b4c6010ab14c9024fd35940de992050f SHA-1: f9f8d685e66c2120c51e9538792f5d823b21e076 SHA-256: e5e1c213e78345e6ecb4a107d955fc6b0dda2ed33ecc58c1c0afcb4a78c3954b
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 compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://capmar.eu/userfiles/file/ripetom.pdf In PDF document text
    • http://cestovni-postylka.eu/userfiles/file/54630352229.pdfIn PDF document text
    • http://misspacificus.com/clients/873634/File/jubevamib.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/57789591096.pdfIn PDF document text
    • http://mousike.it/img_ins/files/dasezoz.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/9bt5vd6vdspb1msvk9kmour9sg/36683812236.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a88918333---likekitufifozujugufowisek.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/66d6426cf2ffe96adff2c3ee7c7d42cf/48685037771.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/4f99a269a4411583223b5cda0f33ee65/zuwojevuvupolikilimo.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/192ee9792bdebab748935b77f58f559d/23939168111.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/870ecfb3bbeec538c1977f3fdbf76306/5817806175.pdfIn PDF document text
    • https://nevisnews.com/userfiles/6123375519.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f08a5d3d49d2e343cd8228aaf2f8a27d/14795293160.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c40a6706bd7---27502229845.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079caac236f2---wexixiberiwokulo.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/b10f4136c8f5c0262b85b15183cf943f/9924578668.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/tejotojawodusogujijidamo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085c278aef1c---xasof.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/19403072292.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/xutororekog.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/dulenewagizutew.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/limimugobuviwojafavoxeka.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/82459035688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=similar+triangles+missing+sides+worksheet+answer+keyPDF 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_off0000e1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C4 16836 bytes
SHA-256: 75b50c85fdad43ef405eec715b1a6daea983908937dcb4ded093ba247e615080
font_02_sfnt_off000125f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F3 11060 bytes
SHA-256: 78f3491b191b52fc35a5c973969f9b22e1670b146e59e955c3e8e10e1f44ded5