Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf74b1ea15a3919…

MALICIOUS

PDF

79.2 KB Created: 2021-09-12 05:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cd190f44beb71ca5c36df902619e0c56 SHA-1: 89b9fce6d4436243b9c80691bae0af5f52738259 SHA-256: fcf74b1ea15a3919225157e9c191262a79ade59702a5250429b18b0f3e553ea1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised websites, likely serving as a lure or a distribution point for further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=prevent+uninstall+app+android+programmatically PDF link annotation
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/ffd27601921781379d6bb0be5ca95b57/nagasavisufiwilo.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/45017638795.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355cffda7b2---93513495456.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/30834309100.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613627490ad6c---mofexe.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/wijutupizulavomuxowev.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/62422211091.pdfIn PDF document text
    • http://agrihitech.net/media/ftp/file/40703106260.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/53780247618.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb08ab9c6f---88987434129.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/fomukaruwakofaguvisoxoga.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/pujiwibubuso.pdfIn PDF document text
    • http://chinalabware.es/d/files/54640174818.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613065219d097---52014995352.pdfIn PDF document text
    • http://4bx.pl/public/file/vazarizimuwukema.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/39251324761.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/bumodusajejumedewunaru.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/70615994979.pdfIn PDF document text
    • http://chromavials.com/d/files/27353273361.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/xozedukeludewuluwa.pdfIn PDF document text
    • http://fluorescent-training.com/file/21844708910.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/5976662827.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/92984821594.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/984315615.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/fojobimafinitagupejosipi.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_off0000cdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC6 17736 bytes
SHA-256: 667e79ee0885919a6619d887a2c6bfd9519c88b4f685c6a9007e924d02a1d3ec
font_01_sfnt_off0000fc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11496 11140 bytes
SHA-256: d9083349ab04df0b102e5d1258c75810f3251f4cc9366df3fec9cf1fe73c4011

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