Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca3adcdd9255207…

MALICIOUS

PDF

80.3 KB Created: 2021-08-16 13:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 62596403a139e53d098ac70ad82b2292 SHA-1: 58e34a556fbb2ab8734eda9a672005486d7bc227 SHA-256: cca3adcdd9255207bdc55b893bfcdd5566624491dbc1b41ba185f3b9414f3d16
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://chcial.ru/uplcv?utm_term=que+pasa+si+se+me+cae+la+vejiga PDF link annotation
    • http://ahkjt.com/upfile/file/vigasokukolusirodo.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/52572471401.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/jawulusu.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/7153683596.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a3e333365---54990068577.pdfIn PDF document text
    • https://taperagi.com/contents//files/gulilidigoxikegut.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/19129480132.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd85cb4fed---17993735656.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/wisupubepeniz.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/96260666079.pdfIn PDF document text
    • https://camelcarpet.org/d/files/zowoliluketafidugajunof.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/miwawogokapexuxetafu.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/poguwarolebi.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161122ab262180---82370884605.pdfIn PDF document text
    • http://redactron.com/userfiles/file/2613738354.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/vikiziterawisiwidavab.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/43671020317.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca58e6adc5---10528226656.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/dcb1a9sqo79qt33c7lq8gllp0c/gezafegavonuwapifevomot.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f61bf19a83---71079344587.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1e7907ae086ec49e032f642ecbd6d7c9/4609262480.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/71915407916.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/879727d2fbd7919e43d26eea8f6d7941/38782973388.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_off0000d54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54B 10648 bytes
SHA-256: d9bdd7600876357eeb67df0820b28f09626f43ee4f5a5ecb26e1c7669a077325
font_01_sfnt_off0000edc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC5 17640 bytes
SHA-256: b5ba62ab32817536021812246c325827ac00c962a07d6fd78f2aec888bea783e
font_02_sfnt_off00011a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1