Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfaccb1201a635e2…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 08:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 36072c21c8b1afdeeecba304b5886400 SHA-1: cf2f9102c0cfc9059b8266799e2b3f261d418eac SHA-256: cfaccb1201a635e2acc482b53b5d56553758db4013aa17257c0770ec2e71e67c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://irlanc.ru/uplcv?utm_term=dragon+ball+heroes+episode+1+download PDF link annotation
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/d5b0246f7f30486a549e88b2fafba607/bogizidumolufu.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad99e0ddc2d---19190473826.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/fifojotutoxosuropanamogaw.pdfIn PDF document text
    • https://bdata.vn/upload/files/fimasapagigokeba.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/pokusamipof.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/xonawedir.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eb7b30634---78633893150.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/10051421066.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/47793932889.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/1c49e5a0d16376127ecceca746eaaa7e/80887054757.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/sakoz.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/jamax.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/p2cl0ch9p5k78b395rtqqsv0u4/janota.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/5206888814.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/runewokubowu.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/38334550974.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/lokokolesilajiwopopex.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/db4838985bf7daf06c47ae8c3da184a0/16051128076.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/77959878608.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/ebf7faaf7137dd6676da013cba4fb3a2/nonoxew.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/43484340608.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/56295785545.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_off0000d286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA98 20176 bytes
SHA-256: 83fd4edc92dc9abfcadbaaca6438b5537155bb0547fc165cc45a70b41c410a9f
font_02_sfnt_off00011fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDC 10852 bytes
SHA-256: 4c9bbef07f5dfcf939f41d8a36f275407c7f3b35cc6e2de5550473dfba8a9cbc