Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f73b81916b2881f…

MALICIOUS

PDF

78.7 KB Created: 2021-09-13 13:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 07b9475b380e0f8757ad028cd86469aa SHA-1: 67f0344fcedf4607542570209951c64230a2d360 SHA-256: 4f73b81916b2881fd73243041c78ccfd4eaa22907c9e2358cafb4dce6a547fd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised CMS platforms or disposable domains. The presence of external URIs and link farm heuristics suggests the document is designed to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=lines+pro+icon+pack PDF link annotation
    • https://nepalipublisher.com/ckfinder/userfiles/files/31919627596.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/tisakofozozumopol.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/49465161698.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/20428979235.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/12430878661.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/89362740879.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cba399d4bb---11197984943.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/pibezi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130985f32877---36752080502.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/wuvizufefifokubelu.pdfIn PDF document text
    • http://change4best.ru/upload/file/lifelepol.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/dugirejevukevajuzazu.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/86361059485.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8daf836fa---miwovapuzozaxow.pdfIn PDF document text
    • http://annabarons.com/files/files/gunijurinomegi.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132ffd0827ff---wiled.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/ronoxufufeloluvozak.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/95718859797.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/78176722080.pdfIn PDF document text
    • http://client.diffuse.info/files/belelikulakegerupibusi.pdfIn PDF document text
    • http://vning.net/filespath/files/20210903161126.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/64283570225.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613210cc2b5d0---36014225083.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324825d3f6b---48766581367.pdfIn PDF document text
    • http://www.toptehnik.si/images/vexezabibaxusupewefaro.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_off0000ce62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE674 18424 bytes
SHA-256: 63464f31dffdf03c361ca0ffffcb50e610f41ead99cd2e44aa7b3b49b2c22f20
font_02_sfnt_off00011603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11603 10272 bytes
SHA-256: 349d01db7a7a1f5126459efb16bb959383616159c5637a388029cb682e77564a

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