Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc20a4e3abdb0b8…

MALICIOUS

PDF

79.0 KB Created: 2021-09-08 18:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 21a3842053640a332195c30653d84647 SHA-1: 366a2f64202620e70f1a376da9573ea7c12682d7 SHA-256: 7bc20a4e3abdb0b86f7c455a7690515c1718a303b5357807d7135477db4ee4a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the document is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/cdb990efddb80a4360dd2e8146d15f14/28256721947.pdf In PDF document text
    • http://flapboxes.com/userfiles/files/52842206216.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/56808594058.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/25628636448.pdfIn PDF document text
    • https://yuktogel.com/contents/files/wokafobebol.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/xalewotezowuzopupilekowe.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/22015275767.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/53973605550.pdfIn PDF document text
    • http://gzsjlt.cn/userfiles/file/19866563797.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/50983295178.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e4144cfb4---muvijedupasoluvurasizir.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/bem8mthpao7a3dkqifugdnthdn/butalisanunepojo.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/kuwutowufagurezomil.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/kogavu.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/bipufi.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/34594060256.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/64223424071.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/46aea3b4f294da4a8b4d08b085bba59f/28446672402.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/93268366837.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/luwaxidubepafurizuxivipo.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/pigob.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wixadilabitanisinuku.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/12187769290.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/binakaxulepusazusuwagujoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=database+management+system+pdf+bitsPDF 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_off0000d313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD313 10832 bytes
SHA-256: 60395d75e6e1eebacc051d56db138bdfa9b1262d2d60e0381c1872bc28da03d9
font_01_sfnt_off0000ebb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB5 16596 bytes
SHA-256: 448b2a76a047c85335b12e58321b96f61030f926432b2c604e55f953911b11f0
font_02_sfnt_off0001165b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1