Malicious PDF — malware analysis report

Static analysis result for SHA-256 9637eb01bbe9a901…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 10:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2d73126675309b95acda60c058dc3921 SHA-1: 001e3a3edf6bcac67433a3d6609b7e53b0e7f575 SHA-256: 9637eb01bbe9a9019652b173b4c375619f971cdf2eb9454287f464c61f7eae89
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly suggest malicious intent. The presence of multiple external URIs and link farms points towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=pearson+versant+test+sample+pdf PDF link annotation
    • https://ddshower.com/ckfinder/userfiles/files/94464312433.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/49210136583.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160895914c59e7---75734030793.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210515143544_cl5zpb.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/2741689829.pdfIn PDF document text
    • http://christopherdallo.com/file/kalor.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/xexakufubovikat.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd18563664---zepajovezemixon.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/wadinoduwuxosapej.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c71560f80f---80771067912.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/c793e4aa6fc4c30e97f50019697e590d/kitavobumuniwovugoxeweg.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160accb2d31f9f---pamujik.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/pivoxikubulimu.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/8pej775rkhsu86792mlo2bhsej/jizupofisomu.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/medaxukokebodijomizu.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/7824aa9d66c02e0ffe2583d7d0925cf4/dikelonipoku.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/ed59b04b61b73978a8784e03a4147503/xakaneguf.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-3/20210703020520736064.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d3ca877213---faxiponenuzepu.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/7133c46f9ba7469a6d88cd6443a99d0f/55845592904.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/1b5s3ifq9e8j5l3favt9dnhvrf/11200492574.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/f84c966903b3cf30524fc0e7c5b205dd/57326182678.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610314ce7d271---34008320344.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/8500940356.pdfIn PDF document text
    • 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_off0000deed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF704 10636 bytes
SHA-256: 7ad82c937cdad1d7df2905dd1f2105cad8131c9063ee59bf8b634c68ce1b2060
font_02_sfnt_off00010f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5F 17304 bytes
SHA-256: 1736de04ce3e79c47ef8d9e228b005608667de0069e756833ee39858e7e7cd07

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