Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79bf9ee998a68d6…

MALICIOUS

PDF

93.9 KB Created: 2021-07-08 01:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 59b8041e79e9a0ce1382cd7cf1eff23c SHA-1: 77be7dc8a86afe320545d582f988541df7ed6f0f SHA-256: d79bf9ee998a68d63249c376bc3a9f7543ffc88cda3df512ffb8ef23fe98c408
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, such as 'irlanc.ru' and 'xanbiente.de'. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://irlanc.ru/uplcv?utm_term=tore+into+meaning PDF link annotation
    • https://xanbiente.de/userfiles/file/57956783303.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/46650032427.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/f9a09751c9bad3791fdd15c1f17aa8dd/48872920821.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/woruxelizawinudenajuz.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b258520a46---kemijorekodisesivatek.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/65503508661.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/loveso.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/68b06369d2669fc0b2d3b5493d25dea6/domobaxigetaripuniv.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/tijujukezanapovukeji.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/10644402968.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/utsfd7uaru8j8m9bifrntauhjd/xurasoritorez.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080297eb6f9a---87651227142.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/eoaid3n3kle67ssgc5isp4iqc6/mipodowezudefirariraf.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/957e943bb969c0895d1a12e167404f01/99280940451.pdfIn PDF document text
    • https://securitydm.com/slicice/file/notitabajon.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/61677372743.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/84641784082.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/72709040190.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/7911033186.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/fifosipusuzisofuferodero.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608e82be4bb83---xenidudivemiwudep.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/minipow.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/42183451436.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/1ae8914039babc348c93f0fa5d949c7e/lafifu.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_off00010be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE7 17688 bytes
SHA-256: 631a2fcd3a0f1c39f493dcd940ebe463dd866c55afdffc0409ac6f0cff80b2ec
font_01_sfnt_off00013a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A53 10200 bytes
SHA-256: 162cdca0a369e391c8448165bb9ccc590cc406b99ef95ee8bf080c0262ad3ef5
font_02_sfnt_off0001512b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1512B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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