Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ba865930237a9c…

MALICIOUS

PDF

100.7 KB Created: 2021-07-08 13:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b3d44e022f44d5a9f195debf427ad20c SHA-1: c5c06c83f5cee7e7443d1fa3bd39b1dd13db77b4 SHA-256: b7ba865930237a9c665e59866330fc7c5012b5ded278fa50f8d8868e3e43b979
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://synerhu.ru/uplcv?utm_term=love+by+chance+season+2+ep+13+eng+sub PDF link annotation
    • https://kisikana.hr/userfiles/file/sukavanejif.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/14929642276.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/nofaxedivabasuzurasukijur.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/vufituje.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/80652341131.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/32910416547.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0c49ff38---notezalasugusopom.pdfIn PDF document text
    • https://dineflon.com//files/4696547412.pdfIn PDF document text
    • http://starsunited.at/upload/files/lapogapasenuk.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbe591e277---dafejasuv.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/tafolaninirapir.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/17072900792.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb45f36241---rafaparikudawubow.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4dec871d17---17563518216.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/fopokegetegutulotipaguda.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770220432fc---tedolefijirususomorawupe.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/e2f4b720a3a64812f77929113f1be221/sudolakabolixemulajumev.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a858e56d067---66041994817.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/4515049035.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/guduropuzunum.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/94f73ff5cafe9c12191bf6c6ef60f6c5/vagulita.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/6f08c829aee5170063412ba02823d963/bajifedure.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160993ba6b599b---makemebozofakezosuda.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F41 11036 bytes
SHA-256: 7442877864f7a77c9f302ec2eb4894cd22d461df18c9973b615cf410a3511a86
font_01_sfnt_off000128d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D1 17396 bytes
SHA-256: 42b61f4bb42b1810b38e899c28d1acbb2c8e9e6bf4a03b4059efc9f461b9f42d
font_02_sfnt_off000155d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DE1 16572 bytes
SHA-256: adc3a919485a1fd568386e5745f1f5f32987729737b9c4fed734941aa606a88e

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