Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4424ffacc5b386…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 08:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 14ca1c4f0bac18424be19cb0d8423156 SHA-1: 6fe6caf3810883541d0fac5e1d106734b715187c SHA-256: 8b4424ffacc5b386354f40e98e6adb292f5a1fe23e593cca5318a08fd69c6936
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content or downloads. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users into clicking through to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/48rsml0t13ah2def43h1iah26k/65030411483.pdf In PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/63727837796.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ba0ubgapem8eh15j4mlcpbebj3/wadeviximakopobep.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/31pe2j9al7lmqir34ardpc7cme/xitadomofolafoj.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/38712048946.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf93f33203---13016304847.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/d148cd2c6b675a1540944e5671633f39/29918301681.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16116041a5ec0f---93924859860.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/xodote.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1611e1d8e7c9ba---rikoduvesen.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/81983101496.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608892298d673---wezirufobubusuf.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/21122957316.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/mixuz.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16084aac0f1196---bikotanekemok.pdfIn PDF document text
    • http://519pf.com/userfiles/files/vujofidigetumibuwal.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/47234911634.pdfIn PDF document text
    • https://ka-base.no/images_content/file/ligitotevuxizizimusipave.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/xedobexufufidajasudew.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/sizovekotolaxarif.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/431d05bf606000adccd9fc6e97875fc9/6078386519.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/17544182157.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e083a4cfaa---kinizatijovu.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/df57ce3addbbbb6528b28ceabb2cbd83/65982043993.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b125f7c28efec5d8fb8b9185d3bdb382/xipatodomevilivuj.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/9676111713.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/e3ulib42hd3uku5ep3dfttc3ij/tepumigel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=free+pdf+reader+windows+xp+32+bitPDF 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_off0000d9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BF 11040 bytes
SHA-256: d87da5f06600a1f942550abbe8d228996fc66be24715ca37cd8e9d0f7c687af6
font_01_sfnt_off0000f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 17852 bytes
SHA-256: 92bd778f5ad64effe4ea13d300078611788ae5ba0e5c5b36d07e4da257629d79
font_02_sfnt_off00012145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12145 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1