Malicious PDF — malware analysis report

Static analysis result for SHA-256 4298922b27d1015d…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 11:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 630fd0b602cf7d1abb24cccce220309e SHA-1: afdf14c8be7d8ba5b9420149c298a6c689c420af SHA-256: 4298922b27d1015d735cc723c3b4ab212b23ede143dd5e34903ff798b5da2acc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be part of a link farm hosted on potentially compromised or disposable domains. The presence of 'utm_term' parameters suggests a phishing or SEO-based lure, aiming to trick users into clicking through to malicious content. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=recover+deleted+text+messages+android+after+factory+reset PDF link annotation
    • http://aotwresort.net/ckfinder/userfiles/files/61692044948.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/45440333642.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/zuwurene.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/75287355233.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/72333469802.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/14116260604.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/revabipobebapenibirapapa.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/31433658665.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/jojusekibuzatixafaf.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/44040509093.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161393c7a8ce3e---61435198284.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/vodejijolofofotikakin.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/doxubojotamaw.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/xadedonepa.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/4t9it2njoljp1u3rv5snavg7e6/7038601870.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/21693722574.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/54255138170.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/27571676965.pdfIn PDF document text
    • http://hbaoge.com/upload/files/zokiwimewilenuvilelup.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613df25481263---rofipu.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/pewodiripelekojigaxo.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422ad78cacc---kukimivuxa.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_off0000d3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E8 17376 bytes
SHA-256: bd85b2a78f0afa784c47fbf95ccdf1f60d0f1facdb3f3e8aada839579b5c8e15
font_01_sfnt_off000100a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A4 11148 bytes
SHA-256: 132cb15b5f139ff6a3d67cb10094d521edd277f3c76a09d970158cff8edeebfc
font_02_sfnt_off00011a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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