Malicious PDF — malware analysis report

Static analysis result for SHA-256 6121ca644fc2db49…

MALICIOUS

PDF

96.5 KB Created: 2021-08-13 23:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1b006a8ef02b0e7ead69bd53fd0e5632 SHA-1: ad3e9f459ee7f0768f11ce477f74b6518448a35c SHA-256: 6121ca644fc2db4967f67a06866a1953ea2ddd2bcc3059a7b83c8c438ccb8597
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/62524890840.pdf In PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95ea3695ce---niwefirafakaxunurax.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/160533395660d2ba43de2cd.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/pebuwo.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/ftsn615331sd5h0a6efpimfjpo/menevegewax.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9edecd5f---nologekuruwevox.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/gojivagizab.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/29098683916.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d357a328fd---vawumilanexolovekopuvikuv.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/sowogudapupavasewanavivid.pdfIn PDF document text
    • https://soechi.net/userfiles/file/78703188502.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/d3961af47dc08782d6a0688c48a21fe6/92340337469.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/41054618966.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/95237680422.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210621192434.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210806202129.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0ef960e8d---96792108332.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/xeviwadirefa.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cbdf98a29---49007839816.pdfIn PDF document text
    • https://chp-travel.ir/data/file/51898838214.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/jojepufepodumusujen.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f6223995f---49700475599.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/rusonavijiwija.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3fcfab042---66227478360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=serendipity+the+accidental+scientists+ielts+reading+answersPDF 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_off00010cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CC 20100 bytes
SHA-256: 3c03fdbf005e9bdea2983322253abfd169f2c190356f4a3fb87d557461a905b0
font_02_sfnt_off00015790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15790 10948 bytes
SHA-256: 278122bfaf02f0658faad249c23e6ad0dc2f60c1701fc62512a94218e5e77e3d

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