Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d25890dc75e6a4b…

MALICIOUS

PDF

70.0 KB Created: 2021-09-05 12:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e777073db855f4f54f16234683691e8f SHA-1: 0108118f1d18ead6315c154c78d436fb2c940578 SHA-256: 1d25890dc75e6a4b6b10335039c587103bf96020c3d081adfefbc6e654521a48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an effort to obscure the true malicious destination. Although no scripts were directly extracted, the nature of the heuristics and the embedded URLs strongly suggest the PDF is intended to lead the user to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://bishopsalamatkhokhar.org/userfiles/file/pameliloxazotaguv.pdf In PDF document text
    • http://robwalker.net/fckupload/file/rutubojoxujivoxixasi.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/61175434895.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/853b9451b7bd30678777a1cb90a1aab2/15616133936.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/25238637420.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16113fe13b4116---23902768581.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/mebinasutetefup.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/javiv.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/ziwogebudugopugovug.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d48ea808cfa---wanavokawonidutovedit.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/meremenukanekefazeputul.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0231547980b32002123b14074907c7b4/muziw.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161174eb89d27b---kekapejapavibepopir.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/64685729828.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/digafabafimajukul.pdfIn PDF document text
    • http://health-bridge.in/upload/file/movidom.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec8df8c632---xuvupovekunuge.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a826af3c2fa---xilobefi.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a74fe3e6c9e437774ec6192137c556c3/35204810862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=odyssey+poem+pdfPDF 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_off0000b1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F3 16228 bytes
SHA-256: ba00f7b0ee14ccdef86f4ad6b8ac21bbe82add58aca523db60aa3de5c0f8a9c5
font_01_sfnt_off0000dbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF7 10196 bytes
SHA-256: 73b90174452807e9bbc1d67e85185cd1f0ac8c73fce7496e94624e8aba8da30c
font_02_sfnt_off0000f2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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