Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe3ab0125b6d375…

MALICIOUS

PDF

68.8 KB Created: 2021-09-19 10:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fda7f94b18d23ed65efc5cb4e559f0cc SHA-1: 941a13ebbc315c80ed7c41b644e717846c820ccf SHA-256: 4fe3ab0125b6d37567e06f774791000d3c51d311841b4e80ed1328c2bfdca8a8
176 Risk Score

Malware Insights

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

The PDF employs an image-only lure, a common phishing tactic to obscure malicious links. Heuristics indicate it's a link farm hosted on compromised CMS uploads and disposable domains, designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://anais.terminarz.online/kosmetyczka/krakow/files/1063762420.pdf In PDF document text
    • http://deeringbayrealestate.com/userfiles/files/rewijuziruma.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/fmeuvsjja00l4ko1qr9vcf18h1/dipoxebaxilazujarevozaj.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f30b9a3526ac9be1bd7ec125ded29501/26009253964.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/56853037440.pdfIn PDF document text
    • https://digireg.si/upload/tokegeni.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/xorejudoxudapa.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/13158396978.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/fininalafumixuzinewadu.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/vilawanogexe.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16137d1f7d9f48---pesokakuvivo.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecabd5f4c8---24291055711.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/xuvufunifumitox.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091412081586.pdfIn PDF document text
    • https://ottopianos.nl/files/militobemijugexagiwuto.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/6jl0b8ho823erm9d2f6igrj5j5/jinesunamizavibute.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/musuzegotaba.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/roxaganexi.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/3d474a607917623bea812dbe8902b201/pijalokezodawixute.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137186c1aa0d---rejufovim.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd5e841d81---taravene.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/16463890631.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/tavamutosumonu.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/62900356287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=need+for+speed+rival+androidPDF link annotation
    • 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_off0000b34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB61 14056 bytes
SHA-256: 85b28569685ae4153e90f4aaf7eeee256b9f61009502d6d2ace846d44c9c8943
font_02_sfnt_off0000ede3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE3 10436 bytes
SHA-256: 1b7ed31226f255f8d3f3cea53a7ddba5459d6648ef5f6436fb56dbd23f85a719

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