Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83948cf4d86c439…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 06:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a88271dac6f7f27f68c01b4cf5f57211 SHA-1: 3b64bf1372aaf44ca0e5e2edb8e801053cc7f042 SHA-256: c83948cf4d86c439963774a226aed466c1959418bde82a2494df32e0ff30767a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, serving PDF files. This behavior is indicative of a link farm used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/c9049baaf140a693a34577bd8abb911a/relomoguveturotefex.pdf In PDF document text
    • http://dientrotiendathc.com/media/ftp/file/96785408481.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/3a5ea33f492bff8ccc397575c1e08351/memubutemalemig.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/15588246846.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/8eecca9bbea73e75ebc138a7dafa91ba/sexulalejigakokadaf.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210906214954.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/d89fb43e8fcd83da438ec7ddac76520e/vesexizev.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161122efc16a05---35542269596.pdfIn PDF document text
    • http://health-bridge.in/upload/file/dupowawadavo.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/fowepofitisuvaw.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/pikedujixokog.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d068006d45---feved.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/30lm81un5lk71kcul3kb9phk7u/xixafematur.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160784fd6e3858---vekokurorag.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/34846753616.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/budatawagevov.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/19058019687.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607213a030db6---meriserevifotubewo.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/65c7ffee9167711f7b763a3f5ed41b21/29476201748.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/f123e85ac72caf79e9902997ab8f26bc/32103795768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=manual+for+gardner+denver+compressorPDF link annotation
    • 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_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 10932 bytes
SHA-256: 1d84ba373ea625ebecdd953132e24eac6d70a1a84cf39439808ef4d6e012e88e
font_02_sfnt_off00010b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B17 17440 bytes
SHA-256: f11fe0c9cd4e56309ea68d90bf93551e6e07cab3b2c047b287dcaf96d7ad6b86

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