Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad32dc48c72f90d…

MALICIOUS

PDF

72.4 KB Created: 2021-09-01 22:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9061d1dbc7108de81f8b6ff04eea52c5 SHA-1: af8b0f1cc82c6c94558207a696dc9f8fda78277e SHA-256: fad32dc48c72f90d318ed829b52dc62dec11d556453c97d3c62ea3db72dfae50
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on disposable domains or compromised CMS upload directories, forming a link farm. This pattern is indicative of phishing or malware distribution, aiming to lure users to external sites. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://seoulsquare.com/userfiles/file/tojiguloba.pdf In PDF document text
    • http://ghibms.com/userfiles/files/26142743862.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/35769c7bf42c79193152cc3378696a09/49324545012.pdfIn PDF document text
    • https://triosms.com/userfiles/file/nozipa.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/gixawaribi.pdfIn PDF document text
    • https://gilbertems.com/videos/file/kobilibezuv.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/25335246943.pdfIn PDF document text
    • https://noventa.cz/media/files/file/48482208993.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/derorakupolimidilowekap.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/zisukunowaz.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210808220540.pdfIn PDF document text
    • http://geasit.it/userfiles/files/35328754500.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/mmp6epe6325lnv97a5rvkfkhr7/11625864781.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/tukibufux.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/76795433237.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/pilawikutebixiri.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/67664985385.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/365v2borr3kfrs1kaln6g70gma/mukikiseronexoropijisif.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/fafimetukinakoto.pdfIn PDF document text
    • https://master-service.ro/images/file/tenozufowagujubasiri.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/10699131658.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3bc55572f---27642759081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=poked+meaning+in+marathiPDF 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_off0000b255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB255 18780 bytes
SHA-256: 6842ea10235380abadc85dc7749084e4d0ec80812b53d72e5180b37824c71a45
font_01_sfnt_off0000e2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 10572 bytes
SHA-256: 9bbfc41026ed2333a29c147bef7f9f55d381a576076d36c0c0b9e891d66123c1