Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ec59011ef5f2562…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 06:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 350b25b567766cb129bd25111430d56a SHA-1: 6fdc6929c3a0f90a90db7ce062397de25c02ca4e SHA-256: 1ec59011ef5f25624d32dab8e3716a453a8158c6abd5090c0432b2c2af2eb471
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing numerous links, many of which point to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.asoriofrio.org/ckfinder/userfiles/files/94610212133.pdf In PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/9c500f7723b4a14148a6e913ef731319/75436458553.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/wunonegodakujava.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/xifexoxibif.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/59058158963.pdfIn PDF document text
    • https://semut73.com/contents/files/85724896802.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/zetoxakimarenofitajaxov.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/56703941693.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/18109807646137ec203da65.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210904133802.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/60322740131.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/gumivoropifurusoxe.pdfIn PDF document text
    • http://sissonne.hu/editor_up/jekerikonev.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109082206328237.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/78197901573.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16138e025bf062---mozopizimolajozokewezove.pdfIn PDF document text
    • https://anup.bo/images/files/31372394320.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/85268935002.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16134c478d3871---78407532210.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vexitidejori.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/79340217871.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/45281289732.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/tuvamurudimebuvapefesux.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/59344146131.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/juvipujasisegizu.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/13808495410.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/24160844582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=rolling+icon+apkPDF 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_off0000d1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C6 10188 bytes
SHA-256: f64abaf2c70d8eab8d4fc9432c5daf2f2d024372d9abc4d5099cdd1fb1573f0c
font_01_sfnt_off0000e8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A9 21564 bytes
SHA-256: 5ecbde5978130d02ab5c79548ed618147c34dbe166512abddb5c33921271b19c
font_02_sfnt_off00012148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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