Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c6cfb56f90befd…

MALICIOUS

PDF

86.1 KB Created: 2021-09-19 03:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4b478e236c2b0453b4b44435ee347107 SHA-1: cf67daaa4c08ae31c0e2713cd0ef5267d62e2bb3 SHA-256: 65c6cfb56f90befdcaaa4dd5ff5e05631f206bfdd44a482a4f64e652b3612cbe
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM, indicating it directs users to potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature. The document body is heavily obfuscated, but the presence of numerous external links, many pointing to PDF files on compromised or disposable hosting, suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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://ski-valloire.com/ckfinder/userfiles/files/lusaden.pdf In PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/n24u8aflacvfciqe91cub573d4/50634901273.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/tefiw.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/dadatezo.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/bewejulunanamopekowuma.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/8731516418.pdfIn PDF document text
    • http://pmke.cz/pictures/files/wezufebapinasadizavidufu.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/mekixolevog.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/80643587514.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210910_165058.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/69975171599.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6520652e8---92569308488.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/rulofugibuvidavug.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/xozotalivagagugut.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/ruleta.pdfIn PDF document text
    • https://aildf.in/userfiles/file/mexinabepivuvi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/eeqdvhln9eqr5hf7fl1av9nig1/68723739348.pdfIn PDF document text
    • http://secretinvitation.net/images/files/reradi.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/98144267930.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/femifewagupodad.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/76937234894.pdfIn PDF document text
    • http://erfansari.ir/ckeditor/files/files/xareketaxe.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/liziwopelaw.pdfIn PDF document text
    • http://mweb.cz/images/file/sazovotinefuwum.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/65545517276.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/bepadamas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+forward+calls+from+android+to+iphonePDF 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_off0000e691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 19396 bytes
SHA-256: 5e254eb3a6fc46cf258eba2aaf0aedb95eb47c17c9f4762960d7b47124ded892
font_01_sfnt_off000118a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BC 10960 bytes
SHA-256: 49fc62960d704ac85e0c8803643822a4d35734cda495be883e122c113ff31316

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