Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0f44f8b63cb6d8…

MALICIOUS

PDF

72.1 KB Created: 2021-09-24 13:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65311a24853e6ff4e903ca6844caec99 SHA-1: 73551248cff6cd5e38cfa4b2ca7e66b68f467fc6 SHA-256: ca0f44f8b63cb6d84245a15876d36e7ccae1cc86be26f78243b269426eb0b8e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised WordPress uploads and other disposable hosting domains, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://smidgel.ru/uplcv?utm_term=can+i+install+google+chrome+on+my+android+phone PDF link annotation
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/48905414586.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/966cc25d9db1dff8942d52fbe35ff09e/7091397234.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/dazitilojebipesibazezulip.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/39856186920.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/vavufu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/33503b136749f2ca2f4aca3e279d93bb/67955254163.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/98212901225.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/jutiberebenanaj.pdfIn PDF document text
    • https://shevian.com/images/file/2925353260.pdfIn PDF document text
    • https://tigapilar.com/upload/files/77368063427.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/fudikomopesobesi.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/lixolawokufikera.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/c6f2fe0441933eab52006b3ccf9f84d0/bitedatezupezipi.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/81644481377.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/6159642218.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/50647591685.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/18713222895.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/13884407766.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/34512805140.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/69259912477.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71961955519.pdfIn PDF document text
    • http://halaljones.com/uploads/files/runagapakogasodomekadas.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/59394354020.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/38445867110.pdfIn PDF document text
    • http://herve-coiffure.ci/files/75522193408.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/30258893547.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_off0000b5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C0 11104 bytes
SHA-256: a8cdf3f1dced2739d57b6e411835cb0980b44bd96e84467c9764f7cbbdaf3224
font_01_sfnt_off0000cf44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF44 16748 bytes
SHA-256: 408e9719317ad6f92e0360fb6d2c668141737d525d23ec7dd99af139587a5b4c
font_02_sfnt_off0000f9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1