Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b7efae0a9483e4…

MALICIOUS

PDF

76.0 KB Created: 2021-09-05 11:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a09f3c64ef4ea23cde90c2ee0d2cd460 SHA-1: 4e4f536afe0665da7e8ab7bb26bb60e9d1f057d5 SHA-256: c2b7efae0a9483e4747d61d436b13d42cc03ad884a5f2325f4d56d3620b47365
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains a link farm pointing to various compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://chrislahoda.ca/userfiles/file/lovabofazi.pdf In PDF document text
    • https://www.upperhousedev7.com/ckfinder/userfiles/files/16705565805.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/483b4eec20584369f97217fd7b7de0e1/43378937971.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161055694b25e0---40679692037.pdfIn PDF document text
    • http://standdominica.org/files/files/30389099095.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/8c80c019be631f1297dac026d1634a8e/memevadabunogevos.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/boxugezilivotipix.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/38522630185.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/23365926977.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/satirijakif.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210803183002.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/25372807025.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/navakuzosigud.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/dupipisemipiwetodiworawi.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/34080743812.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/kemamomisixuresudimuw.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/f3f615400929b99ef04eb2825e035a9e/nunofimuxufijedazuta.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160e56b2428865---nerederamemad.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a31cfb7b164---6760364908.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/26815029725.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609674accf056---fodinodebipip.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/83a048a7d9d030083ab0729315237ef0/bujawopiwoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=scan+pdf+to+excel+converter+onlinePDF 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_off0000c48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48E 17724 bytes
SHA-256: 9d96946347345d51d0692667cb271d7c6df05719f6fa51f85321ae8d3be3279c
font_01_sfnt_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 10688 bytes
SHA-256: dcff8e364981080c86dd62448bce188f7e2353713b6d3229ffa5d057a43193e7
font_02_sfnt_off00010aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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