Malicious PDF — malware analysis report

Static analysis result for SHA-256 036c12cecef1e3a1…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 14:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8126edde3d1d4952d1891809177afc42 SHA-1: b40786c815a66a58dafb9de2511f5e526e24c3f7 SHA-256: 036c12cecef1e3a10899a55ca5256666c26129bc28af12ede481b75c7b8c6799
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or credential harvesting campaign. The file's structure and numerous external links indicate it is likely a lure to a malicious site, potentially for downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=form+15g+for+epf+withdrawal+pdf PDF link annotation
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/o83salgkp6uiecovbvbemsqu3a/34923880690.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/fac5cef5f1b4599d45bd0f53abfd0ed2/xotuwikul.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2847cf1cf---teletifiruraxoseboribig.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/c4ad1729086562b4e03ec1fa7a85f241/46183182011.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/10583172234.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/40339362998.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/24168406969.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b73e467c34b---36639011962.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3b817283a---27175264733.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/31330011445.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075957babe9d---vuvuvomufofero.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/21200793905.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/gesekik.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/piwejirobo.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/potusutolisog.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/86293137960.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/bomupunubalif.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3c6fe4dfb---51866263885.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/a464bd491630c4edfd838f124010aef6/27791661565.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/80349943019.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16089aaa46c8ba---zaxusefiju.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/93c083b5ba12db5bb26b7ac56047c1ce/barijaf.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/nemumumefozeguw.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_off0000d5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5ED 10920 bytes
SHA-256: 6376d918541afe57455426a4577d802f2f8f53c91662b5118675ec8be7764121
font_01_sfnt_off0000ef21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF21 18216 bytes
SHA-256: 1d02a28a2a19ac56058526f6c75fd37cba3277f6a6c0c7d459c72f770863a321
font_02_sfnt_off00011df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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