Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b7c1a45d49611a…

MALICIOUS

PDF

85.5 KB Created: 2021-09-07 15:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3eae006ea4d211b5fb5e2b968852f70d SHA-1: 1a589ed373b2a57429e04ffade49d34ba90c9cce SHA-256: 58b7c1a45d49611aa513480f5d22fe14b7cdb28fb8cec5b3b216cd66c0ccd81d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other domains, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://eds-muhendislik.net/ckfinder/userfiles/files/vovipirakoputiwobagonawij.pdf In PDF document text
    • http://dioceseofniranam.org/userfiles/file/digajanimemeg.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/donurepababeni.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/wuxir.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/51062707681.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/rbkuj8dovjv9nijhc4japla29s/gosezanulugizapaxurid.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/lenajegejusamaronuridema.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/zofemefitotifitexadem.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/704ee8cdea06e47a29ac3c616caeb46f/38039833608.pdfIn PDF document text
    • http://elma1.ru/!upload/files/dijunajer.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/48736973442.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/nunalibukofoxogofevasanuz.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/nejewefa.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/wujasizoduzugedefapa.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/g1tacic62c2uajec8g5r7oqje5/8936849277.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/f0796452c06e308c203817ee3f0d3032/vevozisegonamate.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16118fa8a308fb---rawadofekotonifixi.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/39925878242.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/952132484c8eea3156b48836e5088b81/84312820808.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/7152e992a11d9d1ac4673f2ef07bd623/xowolepofad.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/xoxukibedituwovef.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b4a5db407---lojiz.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/72978501366.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cracking+the+sat+math+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_off0000e68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68C 18672 bytes
SHA-256: 95e5d77e6756cd0e87cc18761628672e23e7f6ab61101a8a01228cb6dd5fa0e3
font_01_sfnt_off000116c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C7 11024 bytes
SHA-256: 8b2e3721f036d956c7cc8eb106f96f0e04b5376674256926caec16ec329d1719
font_02_sfnt_off0001300d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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