Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a66133bd1fd895d…

MALICIOUS

PDF

77.5 KB Created: 2021-09-01 00:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: da47113674666d762157234b2d42aa5a SHA-1: a845e7423c7e0a8f10be6a1cedf55a8c05dd84ac SHA-256: 4a66133bd1fd895dc4756e0b325bc5b6b601e06fe291d6c5d13f0c407f687cb7
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites hosting other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or facilitate phishing attacks. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://sola-brothers.com/userfiles/file/gexavopereg.pdf In PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816da6603c2---daduzofitulegoni.pdfIn PDF document text
    • http://thebaileyfamilyreunion.com/clients/6/6f/6f45d7e5c9279c15d0bd3a3fa6949618/File/rozetadem.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/20814900119.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/2811020489.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b5ec2ab9765f614ec5e87c66df59716e/30272905743.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/b6740826243bf07fc34c6950f47486f6/81375010630.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/3423856076.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834bb7e4145---zupiwibavuwutuve.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/35efaf4de8685c777201354476c72285/wagoxiluxilolokoweketobaj.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/duzel.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acee768143---daketemene.pdfIn PDF document text
    • http://xn--kprq5pvqklteonubj6c.tw/CKEdit/upload/files/24765853641.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/lndoj2c9jp9im3usn9g41fmqj2/37770690780.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/dafevuxi.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/557921047.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/31060274869.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/36561476930.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/e9eigtliqcasbdj8no07o2k234/vedeso.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/ef2142cf7ed3d07bc9b3a6811207b619/50078073985.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/2b18721cc8b4c192f482b72eb1a7f147/rosomisajavax.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/73687346731.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/49511313165.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/darojiwagezude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=adoptive+t+cell+therapyPDF 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_off0000cad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 10500 bytes
SHA-256: c3cf1ddeedf1c4a7f2b33a016a439ffd956e87862dbc50452ec92f7979ba473b
font_02_sfnt_off0000faef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEF 17732 bytes
SHA-256: 7be8063f7bd26a0df9d28503677d53f1ae4f852a83099e718b2e92dcc41ed827

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