Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7074db8e6276fc…

MALICIOUS

PDF

77.9 KB Created: 2021-09-15 10:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9607822d2ec82cf27c29342e03c31c96 SHA-1: 02d154805ae9e556b088495d04a499eb49c1f261 SHA-256: ac7074db8e6276fc93e1a73532b287d7814b8835884806923bd9688c2e7767ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it's designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://oniceh.ru/uplcv?utm_term=free+instagram+post+views PDF link annotation
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/s887iqs4shkjvr921sketltmg6/goleve.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613499a8727fe---671587875.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/juroxudawi.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/vixezomenosavus.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210915084620.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/zekaw.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/20488578014.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/xebukogivejumosex.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16141735476f82---gufomubipovinog.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/2jrauu0nq889me2cf1v2cbdj3b/29579090282.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/29713118184.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/texisorevurarugulanad.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/pawowixigogibibag.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/toligivoragibomof.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/93490623997.pdfIn PDF document text
    • http://hueide.com/upload/files/11711700815.pdfIn PDF document text
    • https://advik.net/userfiles/file/79139142902.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5074c10d4---38387502377.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/visobusadodivolukusika.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16131a1e5a2ae4---divelere.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/51878007443.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/86976418920.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/54722334483.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/12407473904.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/jimawutotamevigo.pdfIn PDF document text
    • 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_off0000ccf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF3 17368 bytes
SHA-256: 5c681b86f9fe7153d1a5b4649efdacbd484500f9886de74fbca5187ea7846bd7
font_01_sfnt_off0000f97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97B 10680 bytes
SHA-256: 8b7f5a67577c221f8058dae72ff8b9cd15e6a5c11d2c3e5d4bfb9272fae9868d
font_02_sfnt_off00011209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11209 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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