Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fbf17595616dec1…

MALICIOUS

PDF

97.2 KB Created: 2021-06-28 01:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d00a558e9fdd4831a10ec17cf6f15e46 SHA-1: ccaac3b543c404cd9fb8ea76a9fffa0b8efc6f90 SHA-256: 6fbf17595616dec1b0bc28fd792fc9e33b9e741ed5edf943697e27bd78da7f9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://chcial.ru/uplcv?utm_term=clash+of+clans+town+hall+9+base+2021 PDF link annotation
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9d397f50e---pitisufolizalolodumuna.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/qnkji9fojme8mf9nmb8epjl7b4/salapasaf.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/df1a3b6789cfb2131b3fe6b23043d71c/jovipovi.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a01eea361---tajenetezifu.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/cinh0gpahkhcebn14vc6jp3uah/56146462940.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf434df156a---naguludonemufexiniruveb.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c928141d2a---21251645469.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/0983f737698d9e85de02ef6fe13c73bd/8058988844.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/jotivanopivelazesulajikim.pdfIn PDF document text
    • http://ruresept.ru/files/file/9117402850.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/xilotonelofodamolimuwew.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/f3f318fba0ca39bd24a86a338e946d3b/27475332907.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/jokizugobez.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/kurawarexizez.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/xoputuwezume.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbed6627e2---lolatopitax.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/nhnn64a7v44ge0qgglbjd7q1o7/rivabekozikofozawumanuz.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/43112959809.pdfIn PDF document text
    • http://minerva-collection.net/files/files/2135855113.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/12149672391.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/f3o6tkjnf3ov9824ipmgp7lhf2/20808752516.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_off00011643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11643 17968 bytes
SHA-256: e72d787c8317f5748e74d72b079cadd304966af5da467acd722478c02b22fab6
font_01_sfnt_off0001446d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1446D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C84 10960 bytes
SHA-256: 6bd78c581feb711493a3de47b37aa61cdc126787df6eb2efa805f14b182aacf8

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