Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c38087cb23ebff2…

MALICIOUS

PDF

85.6 KB Created: 2021-08-05 17:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ebb214bc458287816b4094f8a60318af SHA-1: 10d202652f7ed8d761cdabbb8c06abf5e319b21d SHA-256: 6c38087cb23ebff23334f2235e42d13a3a1e84fefddb2bc69073c3deb1719b48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious intent. It contains a large number of embedded URLs, many pointing to compromised WordPress sites and disposable domains, suggesting it functions as a link farm. The primary goal appears to be directing users to potentially malicious or deceptive content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160827241c150e---77127240399.pdf In PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/kikonalovolofero.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98dd4d3828---ribarosakokidu.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/14382977396.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210716130948.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/44857025592.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/158j4bbvequph940ttt5vb2h0p/3470510573.pdfIn PDF document text
    • https://susta.vn/userfiles/file/juperelizafakesaxolanofon.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/468b14d98112af07b2e92d2863fc9549/6831544606.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///bezikozifas.pdfIn PDF document text
    • https://maisonforville.be/documents/file/85129925618.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/312a2350f148c0395b04eb14844f4af1/51263794644.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/zupalubafajelufo.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/paxituxepelulaju.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/xakafitabigikife.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/xenuxirijuwetetifol.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/24889461845.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29898db289---jusibarefejuwan.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210618_070126.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/c77d66d48d2ddc331d2923583634443b/744042113.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083f8fe0e01b---sujojuzimimoxadusupexaje.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/silusogofetezuxa.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/fdd700b11ffd81ce5c294d7bc4cf8291/34205601452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+reprogram+my+liftmaster+garage+door+keypadPDF 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_off0000ec34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10446 16664 bytes
SHA-256: 2d6e17e05f0ff1b07366c045e7a04e3dd96fd9ddff800d2e570ff0f5b4027271
font_02_sfnt_off00012fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA1 11020 bytes
SHA-256: 05848e141223aff1b2a7f37065d79832b627e0672fb4712a79b5395a60a7f8f7

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