Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c20b41cb02e7e68…

MALICIOUS

PDF

92.8 KB Created: 2021-08-09 00:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0711d8f40732541cfa66446e11df4e59 SHA-1: 2118c3df996e4321ca832f685811aad430e229fc SHA-256: 5c20b41cb02e7e68183f4ef98d2ec5cf591043371e7535c1b3660090ca7305a4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://oniceh.ru/uplcv?utm_term=how+to+get+cod+mobile+garena+in+us PDF link annotation
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/kidadaxuzubudepogal.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/4bmne0eau2i2h2o14p6eaegika/mowojadom.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/lokumajevubiduji.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/wodovezem.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/xakit.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210607003548.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/6858249070.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077df7a26644---76674369758.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c857feae0fa---17133626328.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd7fd30002---44293533990.pdfIn PDF document text
    • http://beiks.info/public/file/38764652547.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/lipiwavufumobavikonoz.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a80f8fc1afb---52035291691.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/wekurutifiwovizozow.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/91975998701.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/ht1vk4ujr1hu826gi4519fc2nc/25430479912.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3ec6d05fd---sisalawajetowizezezezube.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/orqdpct9c8fm0mviha6m0fv6f3/75387401968.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/pefizuruvuku.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/11886538327.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160922678b3733---81883331169.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/soronova.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd1c74e8bc---gazadigenawukefanup.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1A 19684 bytes
SHA-256: 479f3fe4ee6caab3bac75b97757beb30abe79d01f329feb562cbe13f365957a6
font_01_sfnt_off00012118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12118 4876 bytes
SHA-256: 63247f70f24685f9d8c1535171384f4605d6c15c20e61bb36f763be27b6bf19c
font_02_sfnt_off00013301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13301 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B18 11028 bytes
SHA-256: d1d1687c2482f861f969aa6bdcfb823b0232f22eb6708ffdb9767a754d525693

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