Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b06920fc0a93ff…

MALICIOUS

PDF

82.8 KB Created: 2021-08-23 06:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4c7f21f29dfa34c247c8ed174368ca01 SHA-1: f13e84f1edc4a80a69513658c548712ff81aa01f SHA-256: 90b06920fc0a93ff623fda8d26b52c58b92520ea1baf2be233bc40f48c08c287
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://wastran.ru/uplcv?utm_term=how+to+check+aadhar+card+correction+status PDF link annotation
    • https://marblobaths.com/app/webroot/img/files/kubavisuxulefokezazaj.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/zetinareluxexomafew.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a4f9a3398---99070148789.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/91d95a9f893f652b952333c9c27c7a83/6208097302.pdfIn PDF document text
    • http://prestopc.it/upload/file/69575642896.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/lugekok.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/2pjsc612p8o2qji11na9dj5cea/morudineluxu.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/nizamewogusojuropadul.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/69912547437.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/xezijarezomobiwu.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/turilevo.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/3a03196131114347370544e7e4270827/midasajelelumejeju.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610867e2038d3---16729746335.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/a56cae87f296c7e8f926cc1950dcbf44/82814166182.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/ziripure.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114561914208---tizogafobanoguxakavax.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/07b8c2139f37fa903911018b65ba36e5/44300765527.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/jafatukuk.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/83bd32d3961dad98210af5ca09c04424/94473834430.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/tewof.pdfIn PDF document text
    • http://stl-hk.net/userfiles/30369554272.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/30868126661.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/45742570018.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/31513104040.pdfIn PDF document text
    • http://banquat.com/userfiles/files/jovofutipebamibamawu.pdfIn PDF document text
    • http://araonline.hu/uploads/file/26290431221.pdfIn PDF document text
    • 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_off0000e0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 10688 bytes
SHA-256: b25c7bf9d898a5810a03b52409479ca0698e2338d4e1ba865694c8b582c00a37
font_02_sfnt_off00011166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11166 16752 bytes
SHA-256: c76c8235bc382dc1c4c8eabc85c899704b2dbc5f594b1ab5e7d2ec2bdfad243f

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