Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea828936d2518ab…

MALICIOUS

PDF

77.4 KB Created: 2021-09-21 09:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b89522961122f995709e12d583b2288 SHA-1: 23b8e88b469e342a8a2f4f9aec2ed367e07e3c23 SHA-256: dea828936d2518abe9f1bf69ca6228333f7acf00939e3669c091714a3b7aa7ef
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farms suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://polenes.cl/userfiles/file/tuseluvupivumow.pdf In PDF document text
    • http://m2m2design.com/userfiles/pirawarifenunok.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/181445369756.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/zexuzuturomuwukixeve.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/d1717e350b04ef21fdf4c317e4bce2ff/fokelofomafepugolomaz.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/topakam.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/1557225030.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/60668943734.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/gowufameze.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210919175641715.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/593cd97f7f2dfd3c3df41091ae99850c/surezozeruxepolebe.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/50316729094.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/61719576457.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/19567646655.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109170954464197.pdfIn PDF document text
    • http://apsons.eu/files/file/21862985511.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c99b20be49---jajovexowamapetezi.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/bobavipedabigesujevoleke.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/54377964735.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/3913480514.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/98997727611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=full+screen+keyboard+androidPDF 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_off0000c9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EA 17416 bytes
SHA-256: 9721c0721c1defda21693df00d4314fdcfcd5ac8b59b52d7887605bc160c8642
font_01_sfnt_off0000f742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF742 10688 bytes
SHA-256: e91d1b53b3c249427c149771caefc1b5f7e3a8f91be58409a5ddc04e11228bbf
font_02_sfnt_off00010fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1