Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc570143b0cea657…

MALICIOUS

PDF

69.2 KB Created: 2021-10-01 13:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bd2c77f0356d4830a2c1cc249f941825 SHA-1: 21a6e1f2794cf3ab810bca4f19d1c8e4ee68d2b5 SHA-256: dc570143b0cea6577254a12b1a4fd187e2866f7e613d057b710b7e2a433d1957
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=fnaf+the+silver+eyes+comic+read+online PDF link annotation
    • http://jawarakreasi.com/file/bobevozodumufifuzilumefol.pdfIn PDF document text
    • https://chothuexeninhbinh.net/data/dulieu/files/fidelujevebuduvep.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/d2f62eeffd00e8f8637a21bae88efba5/nanijunifidoni.pdfIn PDF document text
    • http://safetruck.gr/images/file/pimoduxalo.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613569cfbeb13---zujovigavuxupowizi.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135db681930a---juxat.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/73689591441.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/97165394605.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/73719015560.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/rufanametogife.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/41982422518.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/41199173164.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/lisegadoxesejivixuzu.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/89628921666.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/zarelalure.pdfIn PDF document text
    • http://cycling-software.com/files/file/70203873879.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/277a26493529c09a3d8382885fabc7ac/zozuwaxirirupasuru.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/42606051525.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/tuzekotezisujumabogu.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161512ad3677fc---72469277856.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/13132761371.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/kivumapimodefufavoze.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615052ab58a5d---91300757792.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_off0000af39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF39 10896 bytes
SHA-256: 56b2c7775091f316cd8de5401c4751377563f5d41d6c64df43bbb99f6d6592fc
font_01_sfnt_off0000c84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE061 15592 bytes
SHA-256: 28c2cc57dd13126797a29854e28d4353571d077272f9af6bb6037f392338e3d4

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