Malicious PDF — malware analysis report

Static analysis result for SHA-256 92be0030306659ae…

MALICIOUS

PDF

77.4 KB Created: 2021-08-28 10:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9fef06bba441de5e34c2fe0a0d11208 SHA-1: abf0b53a943459b908845f7cc49b563812f2f8a2 SHA-256: 92be0030306659aefb90bb52ec73b4fa89b6efbfe448aa4a479f6a0e38db991f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards an attack pattern involving directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://queure.ru/uplcv?utm_term=wii+homebrew+channel+wad PDF link annotation
    • http://miele-service-center.ru/uploads/files/14473440077.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/7738251650.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec1327dd06---54261494351.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903384214d4---goxak.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/josamorojugidimifaxamakip.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021062300554473499.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609483164c8ca---87574130790.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/67b89119293cff4b705cab37bc8576e0/90278165091.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca639cb666---97146458479.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f3f84a4fa---deniwu.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/kudowolaxetumilovu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a56f9ccf95f---golodagoba.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608698d7e4c8a---5593501822.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118260dc6634---kumigukasujivi.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46f7c07cbe---69335502076.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a04c2e2c7b680a2992fd2d543446aa5f/kilabinu.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/93c3380b36150f827395dd05491a1ccc/sedovupesaruxazawop.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///78394942534.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/c6ad78ctpjc0d5tihs9is2g7s3/rowekufanopu.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/buwakujekelis.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/89146288324.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/xedotomem.pdfIn PDF document text
    • https://activepymes.com/pub/file/70917750628.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/jijomokusakutomeva.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/wevutawiseneketuxutigiv.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/11418482162.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/gedovatipepab.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_off0000cbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD3 16356 bytes
SHA-256: b4141ea9488562ce1aa8f8fead190d4b927d4740504dcc624897878856b21215
font_01_sfnt_off0000f67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67E 10588 bytes
SHA-256: 9154a03e97070d34415a6aeacda3fa91eb6f264e5e27271bd7c6aad665e3f2c8
font_02_sfnt_off00010e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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