Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ce2bc0976c7b12…

MALICIOUS

PDF

85.0 KB Created: 2021-09-04 10:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b6aca0378120b811b89f15cce59c6165 SHA-1: f14c8f56153248a365b8f5f49f872a106bba73f4 SHA-256: 98ce2bc0976c7b129bbca6ae712856dbec157f0a585992d04337af3249dc14cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload directories. This suggests an attempt to lure users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/def24c7d75e6d74ef199db5d58f7145c/59028244130.pdf In PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610fb702633b5---74487485847.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210811_3C5ECC614667A7D8.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/judiz.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/pisutugerariruwajekobo.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/farogevusidulo.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8080a72bb---xeretuze.pdfIn PDF document text
    • https://najarshi.com/basefile/najarshicom/files/bepokoniwukafiwe.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/wipawubudeni.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/4904fe38b5fb724f3198fb65ebc29f16/6029008464.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/pojilap.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/u22309luj85p4paqld5cflp2v6/56057961758.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/nuruvorikafevojem.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/ca491dc91a8a03a5b05b6db7b97c4f13/xetijuwibodibunamavatim.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/98388715017.pdfIn PDF document text
    • http://elanaclub.ru/userfiles/file/lizewafabikawokapebusus.pdfIn PDF document text
    • http://derma-dts.de/files/file/jusuzeruvisewos.pdfIn PDF document text
    • http://mav-auto.ru/images/file/nedomabozowiserakilojo.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/ef4b2a7ced53255b302c83416764d7a2/33639892415.pdfIn PDF document text
    • http://ehsclassof88.com/clients/7/7f/7f6c4973f16106f9a1f2948091db50b4/File/99713491961.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/7056750424.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868c681b3ac---bazos.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/22571066509.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/fukuf.pdfIn PDF document text
    • https://xistenze.com/files/files/43173213634.pdfIn PDF document text
    • http://ithaca1960.com/clients/8/87/874e400c25abfb160fd1c0cf9913fcd0/File/fusujolepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=river+flows+in+you+sheet+music+violin+pdfPDF 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_off0000e3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C4 18232 bytes
SHA-256: d24d00c663bc7a355415b677ce8c854b45818734229df1d43cdfe056b692b93b
font_01_sfnt_off000113c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C8 11132 bytes
SHA-256: 2d9b7b686b2deacd61b2cac752b0bb35909745db6a403662ceedbfb0fbc78ee5
font_02_sfnt_off00012dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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