Malicious PDF — malware analysis report

Static analysis result for SHA-256 4269734430f45b36…

MALICIOUS

PDF

104.5 KB Created: 2021-07-30 13:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5e750de44f14581a3f0efd3bf7d8e872 SHA-1: de6103a4dbb79ccb80bb8c2bcd5effe2d6fb08d7 SHA-256: 4269734430f45b3626ed031e605e48b7a342aefcaa1cf2bd075c524ef0cf6fb2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The presence of numerous links on disposable or potentially compromised hosting supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/pn9ktttldpk6pfjffikfgk7bo2/67915979840.pdf In PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/ec8a6a550224e9acbdcf613490633d6c/68516095948.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/79274725885.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/lelesejifetigazezaxewug.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/96400541242.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/26956548184.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/0f848d23f675acf668e1bbf821f224e1/xafejafifufu.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/9e95e13103f046c605722f370f8a0b95/munilufuzerenusozalukib.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/6448197513.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/0cd38cddd04fbdf0548a7ae9f1dded22/buzaxixizotexofur.pdfIn PDF document text
    • https://ahha.az/userfiles/file/72552519885.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/54052371002.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/73281036d95c7959595b2ed5fc0a198e/pezuberizorate.pdfIn PDF document text
    • http://aweibel.com/Photo/file/ruwulog.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/gimusomotebobexukiseriwe.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/jemoxup.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba904669ea9---sutuvalozelij.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/85908620533.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/vapawererufatiduranomix.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/8e679df2e611d39d72dead450c4a6dcc/xovedugomab.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/1lv2js3vuikk9hkrkmd7o21nqq/9131888140.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071fc745ec82---rodafapewidu.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/fovawezesetu.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609269ad09de3---kufojusadenezuzujinavedoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=twilight+breaking+dawn+part+2+download+in+tamilrockersPDF 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
font_00_sfnt_off00011076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11076 18548 bytes
SHA-256: 7d3c630f3009ea8a7488ae554672954113dc9a4e7b5f543b05895fafc6c98476
font_01_sfnt_off0001412c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412C 16280 bytes
SHA-256: d7cd55395ca8c5b3ded2e9f44cdcfdf374181edfe397b2f4d7fa01d4c9eac515
font_02_sfnt_off0001574e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1574E 11364 bytes
SHA-256: f4ed0acbd11bc55bd2cd507f5b5dedafb4e0d2c8b276a7ae711a91b22af30457
font_03_sfnt_off00017181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17181 1784 bytes
SHA-256: e56bba586f25b7bb331306cce9154593ee2e022724dfd3cbe2c17502343e7eeb
font_04_sfnt_off000179e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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