Malicious PDF — malware analysis report

Static analysis result for SHA-256 9341ce12d3a15053…

MALICIOUS

PDF

84.9 KB Created: 2021-09-23 09:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2eb3fe04408c1f0b50ffe924de260b3d SHA-1: b795930ee8da4887c14e70c3bd717eafe500ee3c SHA-256: 9341ce12d3a15053a533d31ddbd06f6ce4d0d26cf275919f541039674237c47e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://proreferee.ru/uploads/ckfinder/files/biteminosogu.pdf In PDF document text
    • http://nyitotthaz.hu/userfiles/files/gomotigabosefodo.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/48636414257.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/weguwojexekirajap.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/dozazozujazilefodivalozas.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210901201151.pdfIn PDF document text
    • https://jagominum.com/contents/files/zupit.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/2650764538.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/88a166eb4249fe872f402e1d533ff244/befaxukesawesexoxifagar.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/63961473277.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/76130509532.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/83583233500.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/mimagekanuwen.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/57020415562.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/46096283934.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/xamumeginunebesunafe.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b81a6cf6d5---gulaxedegokolajebitewer.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/2a374fd0872815a41b14f3ec3fa05a85/787919392.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/27820792053.pdfIn PDF document text
    • http://sjhtractor.com/d/files/xawamuj.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/9ad0549f45f3aab2c8b6135861f0945f/putewuxured.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/33758858680.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091207585447.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/fiwiverokitu.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/jukujisumojig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=download+richest+man+in+babylon+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_off0000e2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F8 11224 bytes
SHA-256: 428d3989092ef137772ea616055aa20a8c7d60e2b71efad5be721f07b5adaf13
font_01_sfnt_off0000fced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCED 18796 bytes
SHA-256: 2a38f04f6a6060fb2d82b4e157fc3c2486a684d3b82230fb1713b001fa2fb3bb
font_02_sfnt_off00012d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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