Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d306b06c48195b…

MALICIOUS

PDF

72.6 KB Created: 2021-09-19 01:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8ec95c1ee48d908507723e4f0043a642 SHA-1: 971e30204e12c81df03cbb06bba1216814aaffbd SHA-256: 72d306b06c48195b951763180724c3e4927da850fa0e0665869cbcf7169016be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. Heuristics suggest this is a phishing or malware distribution lure. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=naruto+best+psp+game PDF link annotation
    • http://www.corazondelsol.es/ckfinder/userfiles/files/xuviriw.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/95079993084.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426c7a4bd6b---molorunixuwonitututudozis.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a19e76f430---85333270279.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347a7c99b12---xisos.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/waguzezodenatapado.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/58523409385.pdfIn PDF document text
    • http://snsi.jp/image/news_file/garegirafimaso.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/xaxazulu.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/7e8c6927548e63e293454757572c9be9/dajepafiguvisofizusezibab.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/91609822349.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/resew.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202196747359942.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/wuvusej.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/62626896090.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/labolitebimowiru.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/lajudu.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/23469181141.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/vezitajufewo.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16140e59f0719b---xazogugugunojinopemamog.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/80976238980.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/solinukamaxulekefu.pdfIn PDF document text
    • http://nenorm.com/files/files/davokuvasadeta.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/5595919623.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/berigujojo.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_off0000bb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB46 16240 bytes
SHA-256: 787d0c969b97666c0cf5fcb5e77313cf0d3f90aef5a36876ff630456e4a3401b
font_01_sfnt_off0000e4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AD 10572 bytes
SHA-256: b0a9f992b2902e94eba3319eb53c541b0b7c51a9ad1627c1e958a5e1ff9fc355
font_02_sfnt_off0000fcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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