Malicious PDF — malware analysis report

Static analysis result for SHA-256 051c63721f162bb2…

MALICIOUS

PDF

77.4 KB Created: 2021-09-06 17:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 254129115fbd6a891a3589fb8f67e8f9 SHA-1: d677766e788343ea524f83b1f1e69f8fa4f8429e SHA-256: 051c63721f162bb26b4e689cff781279ba4e32d22928a95c09dd4fdaa3e6a222
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or scam campaign. The PDF structure itself is a link farm designed to redirect users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://irlanc.ru/uplcv?utm_term=pdf+page+splitter+apk PDF link annotation
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/a8f90c48310cab7a5d896bfe6d38596f/vegijopozidojor.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/vowubulipaku.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/885e667a0ce2f9a5d756ebd9667ac293/45570805344.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/581b6436ba974cb78626588877a65061/2442753844.pdfIn PDF document text
    • http://serting.eu/userfiles/files/vajoligimagu.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/63218434903.pdfIn PDF document text
    • https://bachson.net/upload/file/97566527565.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160831f0a28b13---24874797211.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210807_E818CC6FB9528E0C.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090408483785632.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/papexiduzarojonokisi.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/puvidowubajapaxile.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/19576172626.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/56bdrb2so0mjtjbl6sq7s09j6i/nejijutotunof.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c93aae2bdd---favekuvuxozuronubujor.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe50a3c134---99992408316.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/60521494817.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/rikovisinos.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/f8061f3ca1364de5a7bcb377b29f1311/direg.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/52939143621.pdfIn PDF document text
    • http://co-mit.com/uploads/files/lubitexovafujaniwokiwav.pdfIn PDF document text
    • https://unosms.us/userfiles/file/78632056967.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/b1b7dd80427bd3c323b21603186b2c09/5727229727.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f00917f0006---buzububaginafuwo.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_off0000c7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DC 18592 bytes
SHA-256: e65015255ca8ce58668d37fb1ce8d6042ed7faa072d1833e4b1426200028e43d
font_01_sfnt_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 10540 bytes
SHA-256: 2f317be3f7d97febe2fde240809455806bd06931cb7e05b00dc6bae305d8b4b6
font_02_sfnt_off00010f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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