Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5bc1d01a7ff4565…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 02:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b795649662ba42f878a6f4eee812f51 SHA-1: e887a110fdcad55f9809625658c8fb3241b2d5b7 SHA-256: e5bc1d01a7ff456585f88024ee75e49dd272ab1cb98d683baeda15a751dd373e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=tricky+treat+moron+test+answers PDF link annotation
    • https://bevelec.com/bevelec/dossierMois/file/godosoberepuvuwi.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/waliwizedamedurepiv.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/gujeseme.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/bixitowewigalekaxed.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/86304128996.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/xupisib.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c1bcbe7ef---komobidepu.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/37615685051.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/nrev32ps477rtic5vl8041ss3r/sofusumenobipaligivi.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f35b07f8c3---79320704543.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/11488463678.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/zujuzigupime.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/18ad8170e71e3d234a51b8a7526a06fb/tatez.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087316438664---bowixawaginanafopomojite.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740e28b1f37---24245697474.pdfIn PDF document text
    • http://usmleworkout.com/files/file/vuribatubu.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/ffb8d8bc5b6855ff9f67a189ad8c98f2/vufuzutavazonulibiwel.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/xavutemagekero.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/98407495480.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2069b7d07b---fitabaziges.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/najosidajenuwifowejelig.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/9a3dc7d49a6b81ef452383fa1e12c728/divotepasobu.pdfIn PDF document text
    • https://andrejc.si/files/file/46529489516.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/27166608443.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_off0000e323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE323 19072 bytes
SHA-256: 55e4edf999317848043e216fba1fff7c3654df828acba0b70300a3fae25d74d8
font_01_sfnt_off00011421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11421 10600 bytes
SHA-256: 7e4038170f79274ee18bf97b20698e18483a6c1f9d403493ba20dda4f24d9cee
font_02_sfnt_off00012c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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