Malicious PDF — malware analysis report

Static analysis result for SHA-256 359a76a4cedc85cb…

MALICIOUS

PDF

71.3 KB Created: 2021-09-09 07:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4514f5cd39524be9316127aa92197752 SHA-1: 469aa2a7a071a0283bbd43386504a96b93e9f07c SHA-256: 359a76a4cedc85cbf299e58f6c0bb4b7cc76ffb1670367c563c386011fe6b026
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised CMS upload storage and other disposable hosting, suggesting it's designed to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution lures.

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 http://uat2.hkha.com.hk/ckfinder/userfiles/files/13884092507.pdf In PDF document text
    • http://mascotdd.com/file_media/file_image/file/rilapedinob.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/kotadirobabu.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-2/20210902022204192107.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/99bd648beac616e7f37b463613d739d6/vavapozaxetutaserifabew.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/lisuxisag.pdfIn PDF document text
    • https://okazionche.com/files/4877548935.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/8859473469.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/9d62fb875adf608536cf41e78e50f7b5/47468205873.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dipumasilixuxilukatub.pdfIn PDF document text
    • http://keramann.ru/uploads/files/segavubodevitarape.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/linanalusevusowanasebub.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/zotokikozaxubasafeno.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/53248202514.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/39678428209.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/kujozaxus.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/36136805124.pdfIn PDF document text
    • http://henca.com/files/details/file/pamokupexasi.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/dejojebatepesakedapuki.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210907_F968B8896E2E0375.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613946b9f09d8---xepunezedufukobevabavutu.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/88720817845.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/83391895272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=android+screen+keeps+going+blackPDF 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_off0000b798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB798 15404 bytes
SHA-256: 812d4c1ef40bdcc49a08da5b1cc504dae0797e16ff1dd201b4f92a18b6c19d1c
font_01_sfnt_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 10804 bytes
SHA-256: 9959b4da6e1b925f168bd82a197b56439d50795b8e8e4c007255a91e022b825c
font_02_sfnt_off0000f76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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