Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1b062f96af4d5f…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 13:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5bcffdb3558ef246a508fa8bbe712a80 SHA-1: 4d1c6ce83a08f9636b50ba37be52a662fbb0f026 SHA-256: 0f1b062f96af4d5f9edc78250780b991889709e185751fd39f7c6ecdd610edab
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting an attempt to lure users to malicious content. The presence of embedded JavaScript strongly suggests it is used to execute malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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 http://jandenzobv.com/image_uploads/file/53759350762.pdf In PDF document text
    • https://oklogistic.lv/upload/file/foseravolopuv.pdfIn PDF document text
    • http://gloriamus.org/Uploads/userfiles/files/82652634941.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcefe8ef5f5---tamulalejugiru.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac3cad9ed3---44079160680.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ivijomufotejibowezolaki.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/garefoxogefowuwe.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/80071176109.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/fowopodevatuvexisupojut.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c29723b5603---sitetenoron.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/fokob.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/savoradibokixajetejug.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/54952044191.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/30965889140.pdfIn PDF document text
    • http://alkanboya.com/files/file///48158255561.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/18656631244.pdfIn PDF document text
    • http://minipit.com/data/files/laxusuteverakulenineti.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/75872899180.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/359cf10cf0ffe89531a084d42b5efb34/85573545089.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/f55a4ae168adc7e93f64233ec2e8ea83/17151187402.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/25608309668.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160774a73e5317---labozufejate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=blomberg+washer+manual+wm77120PDF 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_off0000dbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB5 17556 bytes
SHA-256: 70124f43f8e91960964cb20af5520a7de9e328e4ea600480d627226e766cf741
font_01_sfnt_off0001098e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098E 11088 bytes
SHA-256: 2b55161bf5d42435edfcaa8e5ff45178e03c54239bdcf63bfbb14e6cb8dc255e
font_02_sfnt_off0001236f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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