Malicious PDF — malware analysis report

Static analysis result for SHA-256 583111ec9a4b78a7…

MALICIOUS

PDF

92.1 KB Created: 2021-07-02 18:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 42ee3ef5d466349e02df8a07361c0dd2 SHA-1: 5281205af21a19c37804360cff4d65bdaed2888f SHA-256: 583111ec9a4b78a79cfcb08ffa05882ccc72948d9756a456f426f77df7b0292d
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites or phishing pages. The presence of multiple links hosted on various domains, including those leveraging CMS upload vulnerabilities, reinforces the attack pattern of a link farm used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=operating+system+chapter+1 PDF link annotation
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ibgaild9d60uqsk2iqvsjrdbke/fimunifekazizekigol.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/06/files/210618024913.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/6074c45f05e6503781488b10f899167f/98633988506.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a60f769726---55363490279.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd85297ab7d---42273924474.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/45839839442.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861e7610226---45123823030.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/kajorufulorazupelis.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/32117937552.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078b9e8438ca---26113281143.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab83d4f274c---pimawezutevefo.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/41488398681.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/87678455655.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160997f6e0fe3d---3549805984.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c32a865a1a7---96670736111.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c11eb98c4---kupoxividigelutidonilofef.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/nuropadas.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608acdd45ca44---52205658597.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/8c0b0da1ad91dff723240d8b1882b87e/pepopemututawipapex.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3bosot9v2gve9ojiccqq1bmh07/renesuxeligoweja.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/dusapadumiwo.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/822221e31aa6477ac70c467659ab377a/98511187541.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/noborotujavakusonixer.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/8555bc71fb341defcde51535ec56f430/zanutinisibevudefusuboxas.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_off000102bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BF 17868 bytes
SHA-256: 169a10853ee77cd59214964b863ccba6ac2156746f584275573e1dddae556167
font_01_sfnt_off000131fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FD 10844 bytes
SHA-256: 5df1f133346d865dec8edab5d41f68bbbda712d004e98f32aea8497e17e21af2
font_02_sfnt_off00014afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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