Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d2ef9297b7a87a5…

MALICIOUS

PDF

109.9 KB Created: 2021-07-25 06:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 31ba28bd3c52790af569298aa42899ab SHA-1: 623e4e0766e72f23746cf40be11c8dad26f207e4 SHA-256: 6d2ef9297b7a87a5d65bdbbdad2412abb731c6cd8400975cf8eebfbc0b36f627
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content, potentially exploiting PDF vulnerabilities or tricking them into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9634

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://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/a1c8ab5d0e969ba0df486acf169ffe70/98328259325.pdf In PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b82648d3eb---21379996134.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160806e2f3d3f5---vuwomoduk.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076843e40ea9---derudapuzadinevubow.pdfIn PDF document text
    • https://khanikango.in/file/tifeporifeti.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/kodotuwegimobekazojogor.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/89787866502.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c67c75a4e---zadekedixumu.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/mewarofuwagubirix.pdfIn PDF document text
    • http://juha.be/_files/file/7440317968.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845fe50bfd9---xetofaxonajexevokokib.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1f0d331a1---dimudofababafur.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8413f1ee1e---16516612912.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/b0b32c003dab3d17852a2da8c5b8e529/xebubagatomatusuvajur.pdfIn PDF document text
    • https://fallsplat.se/file/pelizagu.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/telodumive.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/48314475177.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f880653b2---11338415113.pdfIn PDF document text
    • http://cecev.com/stockages/files/51543431831.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/lomexofaremakesozi.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/40167470923.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b876ac012e2---zagipajuz.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/dipuvumevapozedodalod.pdfIn PDF document text
    • https://kede.org/userfiles/file/52642302624.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23198580777.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/mefisefigixo.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/82515684528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=download+film+kuroko+no+basuke+last+game+subtitle+indonesiaPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off00018b49.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18B49 18160 bytes
SHA-256: 948187ff6102c776ab12208450bd655807d892817a2314f9be2615ceda65992d
font_00_sfnt_off000115e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E7 21300 bytes
SHA-256: 5b8f583118a19e5dab370308fa6f2b473ea97c70b2abe1ae2f219074a8d536f7
font_01_sfnt_off000149e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E8 3992 bytes
SHA-256: 6b3ed2794f26221a1ce9b2dd5c0ea4f17622a53188d5f09cee58ac4416a6800e
font_02_sfnt_off00015973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001718a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1718A 11116 bytes
SHA-256: 2b9c3a20fbde94b534c4a413d179dc34a1b10cf09be3569159baf03339ea2321

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