Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2c2092bb26c1ca…

MALICIOUS

PDF

70.1 KB Created: 2021-10-03 03:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 80cee87834129204e547c1d0e4145b0c SHA-1: 6f8a68cb6fbcdd16b95a0db762515b32e9829f3c SHA-256: 0b2c2092bb26c1ca6f7c923f25cfeceec74be1c13a5e267e617f0831a3009aec
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161456277413eb---48072989453.pdf In PDF document text
    • http://zanethompson.com/userfiles/file/47669710049.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78617031325.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/xazejapevepinan.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3f8b37ebeee965ddb41f94fd29923161/72208224994.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/jimefagalogivawoz.pdfIn PDF document text
    • https://anandalaya.in/resources/file/mibemo.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/16285687020.pdfIn PDF document text
    • http://unityproductions.com/upload/files/13785318929.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/38112934272.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/24559129239.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/lefafojixujevupopuno.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210926012611.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/napomobunaw.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/87734442660.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/wazotugarum.pdfIn PDF document text
    • https://braus.uz/images/shared/file/65164698641.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9f494637e---bejorarisamibibut.pdfIn PDF document text
    • https://songhong.info/userfiles/file/bivujokolelurazokovese.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/detitisanajaxosudunokovo.pdfIn PDF document text
    • https://majubesar.net/contents/files/sarepazedumawetez.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/zixopetivilolefam.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/gelivipavow.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/60945581239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=questions+and+answers+on+biologyPDF 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_off0000b38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38A 14932 bytes
SHA-256: b458a705ea94e96abf3e97e276f53ac8ac93da9c44dfc1165d9a5e3bd63b1f3c
font_01_sfnt_off0000d926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD926 10924 bytes
SHA-256: 364831cddbcae594d395c2f8f2d53f6a3762fef73643fe8f19d2d1850b86238c
font_02_sfnt_off0000f28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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