Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbdf787df33149b1…

MALICIOUS

PDF

70.7 KB Created: 2021-09-14 08:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aa1d5c200f6f11f0c3262adf31062784 SHA-1: 90041c77f84dc8718b5acbc058f5a7cafb9821eb SHA-256: cbdf787df33149b173ec1c150dd7ff8d9131a79e941ca8c9c5cba4f7471cd5f5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. Multiple heuristics indicate the PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=triangular+bipyramidal+shape PDF link annotation
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5cd2eb815---mexodogotino.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/29484327505.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/96193518967.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/lenejesewunodinoginimido.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/12087255960.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/4551200903.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/vemezupuxud.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/78624660986.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/73487958066.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c6df9ec2d987a7dca5572bfb59ab1386/2294564088.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/djspn9o0o6t2eld8o2kqpp87j0/xafetozojopawufad.pdfIn PDF document text
    • https://bdlvn.com/steel/upload/files/835272300.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/f89100c07468f0bddb4f4c1ecf813be3/30035774218.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/memunoxujunuterovotiti.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/lofojurafa.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7a5c48ffa---41463147440.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/31024687370.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/64701904304.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/morovemirurilomulogetesa.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f75030d57c---susigosel.pdfIn PDF document text
    • http://m2m2design.com/userfiles/9640227733.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/126292026133891e7d125.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_off0000b2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB00 16364 bytes
SHA-256: acba49a46f4eae1f021ea4c6ef9839763c0fb5535e890dca149d19b11259d683
font_02_sfnt_off0000f534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 10940 bytes
SHA-256: ba42eb74d94d28a7a2f45e795e983cb9a4220a82b41e848a1e36c90b780a1d03

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