Malicious PDF — malware analysis report

Static analysis result for SHA-256 0853bc4aa739a302…

MALICIOUS

PDF

93.3 KB Created: 2021-07-04 11:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 70f03e54ba5a98c011c8c2d83e79b8e0 SHA-1: 20054088259ecfa7be1bb7572c9c21b5af1964f2 SHA-256: 0853bc4aa739a302fd40b3ae118b321e3f519b9f0ce349be8ea31585cc4ab507
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external links, many pointing to other PDF files hosted on compromised websites. This indicates a link farm designed to redirect users to potentially malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://laborke.ru/uplcv?utm_term=ace+2+receptor+function PDF link annotation
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/84781229238.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/lajuduvoguwojeboradizu.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/okfjl5e5voebatv71lhac6haoc/80790905492.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e7f6aed662a436cf75c2c6b829a07891/66669145861.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/04052907105.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160773f438579d---48405861645.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/55295506016.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/0530f26e13cbcabe1fccc3d806840d08/67241961902.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/24616248716.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/pjf93pmku1se5jtrmbm8s64fk1/mudewafuj.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/sirejurutuxesipopiguneta.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/65826284408.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdaef83cf1---44482133526.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ba8e70f92---88980579000.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c775e87a42---13927847728.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/62563239182.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16082b5e1c4a50---65803198153.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d060a84c26c---zoduz.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/cqk8ddkk3n1ql0q465ee334uov/36508761308.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/50649262259.pdfIn PDF document text
    • http://rjt1.org/upload/files/bimazojiluzukoterimimi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#Referenced by PDF JavaScript
    • http://purl.org/dc/elements/1.1/Referenced by PDF JavaScript
    • http://ns.adobe.com/pdf/1.3/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/mm/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/rights/Referenced by PDF JavaScript
    • 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_off00010c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001246d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246D 17060 bytes
SHA-256: 68b46f608c49f0b63b375e4b584e9e9dbcc15c34c696fc4696df3af7f9ed7cbf
font_02_sfnt_off000150c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C4 10300 bytes
SHA-256: a1a320f1c80f31c77a7ce506630cf9434566cb380524cf6bac04df5ba9bce444

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