Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3d4521919b5702…

MALICIOUS

PDF

92.5 KB Created: 2021-07-31 12:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7f2ea0af62a24352e25cdb5ad3897c0f SHA-1: 00bad2081e50e38aaf18de24e6c463a42c00e307 SHA-256: df3d4521919b57020593606592a6f518d677a3530a9af60cc60cd873719c1f33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://micro-logic.ro/images/uploaded/file/pisanesusavitejusuvuwebo.pdf In PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf61d9d00a---16627237977.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/33767278777.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/79251099024.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/pulelirafepefuze.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/52162779955.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/zonanizuveruporimawelolaw.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/424abfab82ca5d11a62a97b4ca2d500d/demokanipidimaj.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3be44fa54---78094697237.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/61445192600.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/96388640177.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/f4fabd401b1482c98aef6dbe3fd041a5/waropufipikevu.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/22037602365.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/85424791749.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/cacc464280e921e5be068710ba9c6498/89244530196.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/49436297994.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/9244ea740d100a33bb82b6d1b901043a/powojarekafujatamonetaz.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/dolewufasasu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9671579bb---89786120941.pdfIn PDF document text
    • http://mrmax.ca/clients/9797/File/tisolemigalopigur.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/b3951cdc4e1334aef7dcc048e642d367/vovuronofarabejofit.pdfIn PDF document text
    • http://amdind.com/userfiles/file/butedisizuk.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/f06c9e95bbab5d8847cf54daa263a475/nokoxapak.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/32190031070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pokemon+sword+weakness+chart+redditPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 10768 bytes
SHA-256: 4794e68e2bfc9ac7a1773a9905e2fff6980a1bc99300aeba6972548264a35c37
font_01_sfnt_off000108d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D2 17304 bytes
SHA-256: 85423f861a13897e43cbc3376b9ea2705a396e2d191ea492ea9ac6d950093748
font_02_sfnt_off0001363b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363B 5876 bytes
SHA-256: 643f11bf04f9dff6930f9ffa735b4a2b2da79e4b0dbbb32edbf0ac4b83193779
font_03_sfnt_off00014bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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