Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0692b6b2dc022de…

MALICIOUS

PDF

73.9 KB Created: 2021-09-13 21:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f85f07c97f80144e17cdbb456880bb98 SHA-1: e673d752ccedd1896f65910a7a9236b05d56cd0b SHA-256: a0692b6b2dc022de09b75cd7064698ec7b224517433f6f3549a60238fc3011d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics point to the document functioning as a link farm, directing users to potentially compromised or malicious websites. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users for phishing or malware distribution, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/gejisixabupefadomef.pdf In PDF document text
    • http://olivetheater.com/userData/board/file/givekodumukepetiteratovop.pdfIn PDF document text
    • https://mollis.rs/files/11779505998.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/sezodujaxuforuk.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/vijajegekemabemumupadedot.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210912033714_1207210344.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/39537378598.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/95389451201.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/lakev.pdfIn PDF document text
    • http://unsersohn.com/images/file/xemujoxufeneb.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/rawuzaw.pdfIn PDF document text
    • http://rrarental.org/upload/file/10086218053.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/53296896424.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/kexilijalas.pdfIn PDF document text
    • http://recviem.ru/img/upload/sexiwaxobobawiwolukewi.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/74879138548.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/d81242829c242f34dea50b17be21d6e5/5826175383.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/8695304818.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d34b379baa---85800714925.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/fivalupidopuf.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/59896112814.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/98256291642.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/zowikuzowofejamo.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/44502801921.pdfIn PDF document text
    • http://merwepizza.com/upload/file/30366618210.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137c1c2358b8---85661071467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+copy+sim+card+contacts+to+android+phonePDF 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_off0000be29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD640 10924 bytes
SHA-256: 70772cb022f6143b976270699a789a144aa830285e6f5ae35977ca4d80386633
font_02_sfnt_off0000ef6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6A 16604 bytes
SHA-256: 9610e93f1f239a0174b229d9f70ae6951b73f51409367016820ef5a6fb352aba

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