Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5b75fb0b3ceb4f…

MALICIOUS

PDF

91.6 KB Created: 2021-09-11 16:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0e6074df796947e5fd6cc61111a7df4a SHA-1: 7600bdd42d84325065515b7ef18bf1544b9e0ef1 SHA-256: db5b75fb0b3ceb4fa78429163079b472e255bcdf575848be3c184310ef82e7ea
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ketchas.ru/uplcv?utm_term=powerful+words+beginning+with+b PDF link annotation
    • http://infinity-c-t.com/userfiles/file/50593840524.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/74878676016.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/3c93f1921413b65ec9dcd2564be442cd/9290351302.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/6cacb17247087784c9b9239fbb348046/gawugoruvejekebigukot.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/sozozitovezup.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/43498797368.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/84487592847.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/lodidaba.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/86713260263.pdfIn PDF document text
    • https://angkalaris.com/contents/files/68445335510.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/24291493077.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/77857249433.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/mudezofebuvomesibipujet.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/muxijo.pdfIn PDF document text
    • http://platcometals.com/images/file/18567079082.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/misimafumetusegude.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/69305024261.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/33735268791.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16138ea47a76cf---75409443567.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/9680668587.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/62456988200.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/filobepevimope.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/kuvaxam.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_off0000f9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 20512 bytes
SHA-256: 93e47b8f4c68579d35b8316b69732554d8179f739116bbd1c5a054ec700d5e2f
font_01_sfnt_off00013027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13027 10800 bytes
SHA-256: a3260edee0e806adaa974d07fcac39f6d03b66a6b0c30ebda415ec8b7256ff94
font_02_sfnt_off000148d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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