Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b91cd2cf0b8200b…

MALICIOUS

PDF

95.6 KB Created: 2021-09-01 07:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cee5874fb3a12c1d108e8fbdfd8d3b9f SHA-1: 38d060762c98015cae3ed8a3f4200b93d39a9f6c SHA-256: 7b91cd2cf0b8200b56cb07b16e873d7892d9ce2d1aefde3f83f1d3399de6fafc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. The presence of JavaScript suggests potential for further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7085

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e2f0708b2---zigaxunowotimovutaf.pdf In PDF document text
    • http://industrialdevices.in/uploads/samamixofej.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/4926353398.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/suporidawe.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f7fc986fc---99737717716.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d2468f66c01---bufuvoboxunarekolafodezu.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c3529a161---25682774222.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16107c519bee5d---kevolakazetowo.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/b2c4c29488a5fd831ce7cdc3945978bd/3763041860.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/tn3ofgc671fj3vl1der4ojjtra/54319008005.pdfIn PDF document text
    • http://davcpundri.com/css/file/mupesikokatijowat.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/0c5557656eb953664da69396545b162c/guramusad.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c50bd8b31e5---18207445110.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/1lvdt38miunv3pvrn7gr34brc2/93195869215.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076debf0c854---vatagojeta.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e2607a027---55967352306.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083165b4d5ec---denawuboko.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/padisugigagivujolobowir.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/b0f88891ce732fe5585b12dc8097a2b3/pisodalunukexes.pdfIn PDF document text
    • https://akemi.ro/hirek/file/85707979496.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/29154318067.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8b606aed4a4feb7556fa4e2f917132d2/tufisifuda.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/lesipuzufenodulifawufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=nortriptyline+uses+and+side+effectsPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/dagapoxatusuzupelilakaba.pdfIn 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_off000118f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13108 19844 bytes
SHA-256: 5ba9aa51829c0a91b3603b8082802e4c83f12586989054f55f1179229cc08784
font_02_sfnt_off00016584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16584 10804 bytes
SHA-256: bdb54e20b205747c375436d936e8309a5a192442209fb49a8483a51f2192d806

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