Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c04ab40c524b9d…

MALICIOUS

PDF

71.3 KB Created: 2021-10-04 00:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f89c289c93928b85747071487dda440b SHA-1: f7e72657f6fd26eee068c96fc74d016182c150bf SHA-256: b6c04ab40c524b9d488acd0e46110802426fb059275a86b52518d94ecbd9c5a8
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, some of which are identified as compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

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 http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/xefezivadurupafomiburat.pdf In PDF document text
    • http://chinazzjx.com/d/files/bolesukasiwisixamalojewa.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/kepezobetaxoligipus.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/754cf9bca508dd40ccdaf274d31ec114/25190988131.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147693157a4b---23454025813.pdfIn PDF document text
    • http://china-shengbang.com/upload_fck/file/2021-10-1/20211001210820406220.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/noguxot.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/90282731999.pdfIn PDF document text
    • http://alltechsro.cz/files/11354805096.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/mujukeparet.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/16265630405.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/wikemuzaligo.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/75254064206.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/4htkatvl5jkng7ftmdusoas8p3/nunejenulusab.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/73854218142.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/popozetadunuxizuj.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/49352724758.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/livofen.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/27740213180.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/71084560712.pdfIn PDF document text
    • http://koddous.com/userfiles/file/roxubapomom.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/sidogexogax.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/3254899647.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/25514800494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=food+cash+and+carryPDF 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_off0000b444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB444 10192 bytes
SHA-256: 3f6b07ce324f37daf38d3ed0354bc8a9cb73d2c7c0d1a8c62667f0deb8a529e1
font_01_sfnt_off0000caf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF3 17644 bytes
SHA-256: b979f469a3622f70b2559b571f299d8f1a8ad5f72e6715a89f590813f7756ee0
font_02_sfnt_off0000f7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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