Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca686f6780896aa…

MALICIOUS

PDF

70.9 KB Created: 2021-09-03 02:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e8ad4cc8d73637731536ac43fdee0a74 SHA-1: c28021c4f42192a68862653e2609583e292411cc SHA-256: 3ca686f6780896aad305cefcdb1a77d03f46d6084c9fb43cd8d8b569b1c8a4e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/vejefexidekiwifidel.pdf In PDF document text
    • http://alpha-th.com/userfiles/file/fimiwowurok.pdfIn PDF document text
    • http://poorclarescork.ie/images/42811406178.pdfIn PDF document text
    • http://kkitv.com/images/upload/File/narekuxobefile.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/xemesog.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/52607144671.pdfIn PDF document text
    • http://rosswellbulldogs.com/clients/b/be/bee1e50a814ad4ba40998340b8964064/File/ziveropuzosate.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/xerisizileleduzigolepuf.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b76366cea2383903d220c4f40a319516/44707734839.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16088dd99a6ad5---28208248326.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889a687a6f5---69569914918.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/16196644791.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/87188108650.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/32187946981.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/55022449812.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/33f1d4f96a3e93f5af46b6f777c0ce01/61634589716.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7e33d31a5e65ffacf6852ef4963600f6/nerufufegeroxadewoker.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/30591251518.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609079433a962---44330205226.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/84050557054.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/zexovefobaduvijowukeg.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161293eb17cd29---63353535981.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/rugenofateb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=whirlpool+cabrio+wtw6400sw3+service+manualPDF 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_off0000b3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEA 11564 bytes
SHA-256: b08f5104e63ebdaf4204915de1db483097cdb4f71f6ee8d6f1756ddfb97f5090
font_02_sfnt_off0000e713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE713 15196 bytes
SHA-256: 1aec376051b3b26ea798dc2fd466cf5a37abdd47a358e5c27a5a8b0af627b505

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