Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba70cade5e0feaa…

MALICIOUS

PDF

81.0 KB Created: 2021-09-01 20:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 91c48e187abba1194977ed61140a6c63 SHA-1: 06ce985d1b5628138ed920a1a1fac27eb3619ebf SHA-256: fba70cade5e0feaa2136ec58070f40f0ffa350bba62dcdc4ad00e427d5e3b9a5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to PDF files hosted on various domains, some of which are associated with compromised CMS uploads. The document body is unreadable, but the heuristic firings strongly suggest a malicious intent to redirect users through a chain of links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://birudongker.com/contents//files/57182320025.pdf In PDF document text
    • https://schmitz.cz/res/file/25154591758.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/keguvejuti.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/27478479151.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/32407258133.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/jseao2hd7kq4gcqal85u10tgsf/15540426319.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886ed46d9aa---renusazilarofuxemabejav.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/9598474256.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/65715055293.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5a81ae6d7b262010c4f839af26d386a7/feroxopesegasobebogega.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/il8e3jhuu50j2u02e3qd96domd/dikejogoloruba.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/semevurajusabugibedota.pdfIn PDF document text
    • http://com123.vn/uploads/file/93125596294.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/bidozesevaripipozi.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb5ebb79b4---36581557543.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a3767b7d8---38444550005.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/k909d6i7fvfobpqlt4q6jptd07/nawagikezesusa.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/48261143777.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c2400f62e---bibagerodade.pdfIn PDF document text
    • https://turbooto.vn/upload/files/71708674849.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/wupexitevulexitatevo.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/tonomukorup.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/84704865110.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/5ec4eed87f8c2b3a557817f0d801fdfd/85381669835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=steel+used+in+rcc+constructionPDF 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_off0000d82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82F 17596 bytes
SHA-256: a6835eac4b6aad8aad54b5eaa48a0d38158d381fe956429dcb47fc08d354e07a
font_01_sfnt_off00010558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6F 10376 bytes
SHA-256: bc482b230119507f3c5f2fd155260b3b8bef6559f5d63030a2e04e7190c8de3f

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