Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d1fc66c0b3af2b…

MALICIOUS

PDF

70.0 KB Created: 2021-09-08 09:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 504a6bc86f22e552d756a2e58bc28976 SHA-1: f8da4625f1eebdfab8f9234d747fc57ae5a3f794 SHA-256: 40d1fc66c0b3af2bf23d38a7b690f14aed46e1ca052b432f1f01ad5abe19abe0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/favusixujebekefaxus.pdf In PDF document text
    • http://xedaphcm.com/luutru/files/72732735386.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/sijeliwaz.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zafujibidakerokadi.pdfIn PDF document text
    • http://gewald.ru/content/Files/48001512159.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/suzopuzejifevupusoxiseka.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/fezijusirur.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/18900099204.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/tumoviz.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/rozap.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea4d38b9ae---muxurimejug.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/gosawofokopusofeve.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4eaa920ef6---33037972493.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ecbb014a5---watojewuwaji.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/0hbiafkm4kvkmhtao0e0gfqjqu/xigikenofa.pdfIn PDF document text
    • http://micruts.org/userfiles/file/ganogubujuluw.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/1018272044.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/db42c4f5364746f8ea6c8c1adc3f544a/kelulapuziwi.pdfIn PDF document text
    • http://signauction.net/userfiles/file/38481805481.pdfIn PDF document text
    • https://mfdesign.hu/files/file/tawevogonari.pdfIn PDF document text
    • https://digireg.dk/upload/9006815364.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/45658682793.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/29205311441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=shallow+tabs+guitar+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_off0000b000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC812 16684 bytes
SHA-256: f9a923c138d67756db6c0b20e62a187f6ed89261024c7ec24ac312917f9881dd
font_02_sfnt_off0000f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 10944 bytes
SHA-256: ad785b238773afe39492d607a200c314caaa67980ea43ae860822b03c7b174b5

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