Malicious PDF — malware analysis report

Static analysis result for SHA-256 70132cf960ce3d80…

MALICIOUS

PDF

206.5 KB Created: 2021-07-15 17:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4d51d65b0c2c264dadb4cbe561872aa5 SHA-1: ae5e05cf572998cdd5f4c2659768b71b0551862e SHA-256: 70132cf960ce3d8079b0e9e9ea7b9702da1f87d95521a13d8f5873d26fd0121d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity finding for a link to an algorithmically-generated URL hosted on a compromised WordPress site. The ClamAV detection and ML classifier further support its malicious nature. The embedded URLs suggest an attempt to redirect the user to a second-stage payload, likely a phishing document or malware, hosted on compromised web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://alajuusa.eemedia/contents/file/zolutemisefemowuzubizi.pdf In PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/d867cbd342971aeabeb30c937bed15ff/joremofipotugex.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/4302301583.pdfIn PDF document text
    • http://belst.by/upload/file/direzivexufofekezemenafov.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/pawusarofufipabavezu.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/kqpv9lbr57au13ipom2il2umgb/sirot.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/pinavuworakexasalufoj.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/24907376032.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa7617fa18---masak.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/jidixanegof.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/79526237201.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/6h998rn59hdtjt1pm8bo0l3gos/10514285293.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e8bd572d6---kijanebuvuwuxotebewu.pdfIn PDF document text
    • http://yuhongzg.com/d/files/97695478440.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/f7e5d69a4c062f8c2e3289171b11f317/20029672095.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/55018542350.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/xosepepo.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/10faef10df9d01884f11f2a314b410e9/levokabefuvuk.pdfIn PDF document text
    • https://olterus.com/contents//files/nadikun.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/58728129674.pdfIn PDF document text
    • http://safetypath.net/cms_images/zasuwo.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606efbfb3576c---45454835128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=textbook+of+limnology+5th+edition+pdfPDF 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_off0002c919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002e130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E130 11060 bytes
SHA-256: e74c51fe114fc5bb59dcccdd6e3130b1d3515f0d55a8a0b52422eeb634738dd1
font_02_sfnt_off0002fa50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA50 19596 bytes
SHA-256: c46793537196d57d28d4166b75ad747727a7a80780dd1087dcd3b2753a42e487