Malicious PDF — malware analysis report

Static analysis result for SHA-256 82cfe749b417cbb9…

MALICIOUS

PDF

115.6 KB Created: 2021-08-16 12:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00be3d95d82c919ae4e12ebe8916e6c9 SHA-1: f6e19ac76e8f7a4595d756544a52722da33144d4 SHA-256: 82cfe749b417cbb9fa60073ff2f504bdc87a782172d1ca0866afd8acff4415ba
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it's part of a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, aligning with phishing or tech-support scam tactics. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://saringkarnwood.com/UserFiles/file/gogibetediposezadud.pdf In PDF document text
    • http://btfa.tw/upload/files/mabegotugin.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073834a0e639---kapupebaleriguvikuku.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/981323e09e274872a9b4c4b14ebb79e3/24543031714.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/mezafafukusuro.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/33620638641.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/17126626231.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/e1e71d9940c36f5a6227c2e07fc7bb52/nuritaxoxonixoronigaze.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/xijufajobuzoxaxojolo.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aab61da942---82953972891.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/89234327144.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608845022f761---subuligular.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/2oljs3v7m645263r4bjkv76pps/90360593845.pdfIn PDF document text
    • https://majubesar.com/contents//files/nuzifivomelulivolej.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/75156034987.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/80d894a4gn90o4rdc699toln04/43304435846.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/11047f1dda4760010b3b9778d87a7826/87310743174.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/a2d646dad9916d9c85839855b11b1157/derimigasu.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/18532020263.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/pintuiii9tdjecfo3a9a4nf6t3/xuvebosomorapi.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/tijenofonize.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b69fcefd39---piruvobumemij.pdfIn PDF document text
    • http://goref.ru/files/file/tukutimovaredojerikibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=original+ayurveda+book+pdf+in+hindiPDF 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_off00015d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D00 19436 bytes
SHA-256: fa55167292f9e5a037aabd6a74e709c0d381e7a2b40853eb54e235c27c07abcb
font_01_sfnt_off00018d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A59A 11048 bytes
SHA-256: 582a138c1418a3dd334cd9b3c78223f4fddeef387b111e4002b7528d8036d8e2

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