Malicious PDF — malware analysis report

Static analysis result for SHA-256 141d1278e2e27cc5…

MALICIOUS

PDF

84.2 KB Created: 2021-09-15 16:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b33cc5b08b4a5d7ad36d8bf5e1f2c7c9 SHA-1: 1e0baa3b267c7329b4ca8a72db6a9136c267bd36 SHA-256: 141d1278e2e27cc5707902377bb633d7f79dd65f426081694af437064f3f3ac3
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm for phishing or malware distribution. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pixomot.ru/uplcv?utm_term=apk+gacha+life+mod PDF link annotation
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d60f10cf29---komedolikeseruveligojadu.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/54088606670.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/pimusikapub.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/79392170969.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/76881105557.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613770008455f---2727259971.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133438e41859---dijakamegu.pdfPDF link annotation
    • http://sibaco.ru/ckfinder/userfiles/files/dowaro.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091001070897.pdfIn PDF document text
    • http://espwireless.net/uploads/file/61552141081.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/57561212315.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/26004005159.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210908_221330.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/jalubeterixutilotulo.pdfIn PDF document text
    • https://zzwgjx.com/d/files/kamidulujukepenorol.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d80eace2---12416984126.pdfIn PDF document text
    • http://farashimirooz.com/files/luxezebujeb.pdfIn PDF document text
    • http://scsytech.com/upload/files/63899794144.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/museledum.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/judujazodokamimuxurepalin.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/29865432253.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/13853426655.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/a1570a5007c35881ba15d9b1ca771886/62702213558.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/6250526923.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/30477368927.pdfIn PDF document text
    • http://olympusflights.com/files/files/fojimenuredoseter.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_off0000e530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD42 17332 bytes
SHA-256: 382806fb5f23cfaa1ed8443b6b7972f06435b2ea6bff6511d7a1a0e8a4c703a8
font_02_sfnt_off00012ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD4 10672 bytes
SHA-256: d652fd55621666d3b369ebd9b366cdf0b91d90cda88ffba14dde84198f3ff5a6