Malicious PDF — malware analysis report

Static analysis result for SHA-256 c48d93722dbf0506…

MALICIOUS

PDF

91.8 KB Created: 2021-07-23 19:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 15928f4b7074c7f709ea115448f1bde7 SHA-1: 0e4d3e2303a42a5c7719195ab36c0bc0f101bb29 SHA-256: c48d93722dbf0506d3a3840410e613b934f11beac90d49748df08dbcfe3cd96a
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, some of which are hosted on compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristics point to a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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 http://ballmillfactory.com/d/files/saxafuzewiba.pdf In PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/df617c096422a237280869f0ed7f83f3/66070188517.pdfIn PDF document text
    • http://nfc.soo.jp/file/dikar.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a923852b35c---boxasogujadoko.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/6008271312.pdfIn PDF document text
    • https://chptravel.ir/data/file/dupifagokawujoli.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/57369660016.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6380624f70---lelatiwumikanulubare.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/58471438478.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af0d29ae9b7---6434847362.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/95594223900.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/kiwelasebig.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210620_a61b9.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/7291126590.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/zakokur.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a9676e5f3---waxexuzikuruzip.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/mebif.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/zofizunumemafuxofodotoja.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc653e7349d---40174244748.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c490e2e76d8---44659409758.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/84585433758.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/3323274650.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/b4c777d7e8f2ba1667ba79c9527d7f2d/noxanawa.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/59495832667.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/9fef826d83bc436748cacb4f4b2c1c45/zopojipesosevupexer.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/tiluwobima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=peque%C3%B1a+historia+de+la+fotografia+walter+benjamin+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_off0000fc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC83 11756 bytes
SHA-256: 640faaad2cfd28620d20e8d19dc72e52131d58bafda648dcff55a7a51a55de25
font_01_sfnt_off00011775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F87 17968 bytes
SHA-256: cd0117b13eb753c1866b7632f04cd9ae211693b733ca003eb69a6a3e3fe661ea