Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b6595fde23e5ad…

MALICIOUS

PDF

80.0 KB Created: 2021-09-04 03:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e98202f3fd69e2b0a5b030b3e2df8f6d SHA-1: 44c68f0a9c8abd6dc428ed07f70d2cd83a263a3a SHA-256: 94b6595fde23e5ad692c40c714a55597ab21472b835b4e22f699be5702b54825
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Additionally, numerous URLs were extracted, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier further support the malicious nature of this file, likely used as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://asupuro.com/upload/save_image/files/nisifagotanopizerofexama.pdf In PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/dh78foa1ojcqtnh7be52f53oki/25701558525.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b463065869e---79988997689.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/zaxojivevi.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/8840005670.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/mebosumajedun.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf41cd1cd49---gomobexir.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021070213504980554.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c6969f7f0e24444eba3127c4b7d128af/pagudetudutajafo.pdfIn PDF document text
    • http://waterreducer.cn/d/files/bewojosonojawoxip.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608621dba3f00---sivifotukejarisesogajifu.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/fuwudadosanuti.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-8-2/20210802002031792564.pdfIn PDF document text
    • http://whatdwellswithin.com/file/raxewezabefigimopanutuxi.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/mezura.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/sinenabisapanivavuvawe.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f734c1b19---86302083987.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/51852175452.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/9aa2b22ad5151d055ccde94e92bf308a/zidozorojetisig.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/xulujukugaxilarujelamo.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/luvirivisumuneturam.pdfIn PDF document text
    • https://tepihtrava.rs//files/97136505999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=tommee+tippee+digital+ear+thermometer+manualPDF 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_off0000d43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43D 17696 bytes
SHA-256: 88613f529296456cf7be026e132f7d7c61653d37cc0cf61371c1ab4e7f5ff049
font_01_sfnt_off00010224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10224 10732 bytes
SHA-256: af875175ba8d4b3797f4e413ce52057e55dab4fe9a8f94cde3f222debd0ff1f9
font_02_sfnt_off00011a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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