Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f65e3986a5dbe8…

MALICIOUS

PDF

81.5 KB Created: 2021-09-22 09:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c1c40434f7a0fcce98f2dc9df974e9e2 SHA-1: 82058d610754dfea6013a487d5fca4953526009b SHA-256: 37f65e3986a5dbe8204f999c2692223a88f3763b4bba27ac79befef546e081b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external links. Heuristics indicate it is part of a link farm, with some links pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=tenorshare+android+data+recovery+full PDF link annotation
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/jujalulaleguber.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210919225022.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/50110871918.pdfIn PDF document text
    • http://voijin.com/userfiles/files/9272569650.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/17807609325.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/xamujeb.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/wogivababizupobisi.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/69789929397.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/dolexezirevizojon.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/61ac25e4d5b99e4c19894763d3974162/rebizajiwosevamogazemivo.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/66282431790.pdfIn PDF document text
    • https://nyig.com/files/file/zevikirupela.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff8e396a7f---81600209961.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/24790746834.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/49173008977.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/31a110fe3045ca5b0d222c8aee4aa4de/sugufepigotasag.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/nuruperaja.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/sodoxoxita.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210904_075027.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/59076725722.pdfIn PDF document text
    • http://berbun.com/user_img/file/53981865239.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/dipeviwixebebinoxoweni.pdfIn PDF document text
    • http://word.mn/uploads/assets/lexezudadowi.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210909152434849699djasmmsbizlz.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_off0000da5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5E 10816 bytes
SHA-256: 853ae8b02f41c7821d2353e82d7c3857a4ed42711d062d993c7bf509a6cbbbf9
font_01_sfnt_off0000f350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF350 17384 bytes
SHA-256: f1fd406a53885efaa8be3daab8d9e2f3697944b2c3ea8cf6ad087b4440a812e6
font_02_sfnt_off00011fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.