Malicious PDF — malware analysis report

Static analysis result for SHA-256 02af37615556150f…

MALICIOUS

PDF

69.1 KB Created: 2021-09-18 14:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d79b9e73c6440a8a2f2a42c4075273ed SHA-1: 808d26c49d445342c99009151cc78c7fa2073073 SHA-256: 02af37615556150fd690598cf2378031008f53cf7862be61f9ef9eec00fbf5b0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and potentially malicious content, with a high ML score and ClamAV detection. The numerous embedded URLs point to various domains, many of which appear to be compromised or disposable, suggesting an attempt to lure users to malicious sites for phishing or further exploitation. No scripts were extracted, but the structure and URL patterns strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=vector+drawable+editor PDF link annotation
    • http://kadh.kr/bobod/upload/file/bujawigagezapil.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/31157842064.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/kgedpdb2or46kvoibmiftds3p1/mexisoxuzakog.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/84510831507.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/4084004597.pdfIn PDF document text
    • https://rais.bg/uploads/file/simurofababemebedilusofi.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396835b4c92---judidegebigiriw.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/73433578061.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/40045926467.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/zedupoduz.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/77173829358.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/xenowomadeniwarovesugol.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/3536f31e8a1ff133158d6ac162e1d7ac/rejigolepanapetimor.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/nemarikarasafiko.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/walemivipojenozomewobapez.pdfIn PDF document text
    • https://alpinashop.bg/files/gomizefafo.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/fomilibonotowubujur.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///gekuwibakivovobolexoxezi.pdfIn PDF document text
    • http://metabolit.ru/files/file/fuwegewuguzadukekaro.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/burubizuxakurenuguti.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///53645618350.pdfIn PDF document text
    • https://ratodua.com/contents/files/fokidezavowezepubebigad.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/sodusuxare.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/34536817238.pdfIn PDF document text
    • 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_off0000b14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14B 10288 bytes
SHA-256: 9069fa1047235d5f063de57350908e5644f0c67dfc1dc9b60d3fcaaa4c4bf2ba
font_01_sfnt_off0000c89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89C 15060 bytes
SHA-256: 728c9d24eb62b8593e3ec6079f6bc0f31c8d66ff7ee90b16103a29c23b6483a6
font_02_sfnt_off0000ef3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1