Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa7cf4ec7787967…

MALICIOUS

PDF

95.6 KB Created: 2021-09-03 08:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 53d00f5cdaff30277d042d5ac458b519 SHA-1: e33b22af39cbff32616c03db8cb06eecc38970db SHA-256: 6fa7cf4ec7787967b19b3b03e0f509a805603db01eaad8f966667a8b67901809
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://jpsacademy.com/slbdavbatala/userfiles/file/11110492963.pdf In PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/af1962b7af9cfb503692ed47a6d44479/65402207873.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/39189495927.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/7ac3f00ea023381688f2426f14564905/87407802501.pdfIn PDF document text
    • http://pinetreerealty.ca/clients/55933/File/tufokilubezoxedopalonu.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/kaxezezuvogivu.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/73406215835.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7a2730f6---juxitenomet.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb840664240---23794920448.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160750315d97da---24777812619.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/60270799244.pdfIn PDF document text
    • https://ayurmitra.com/files/file/sovibijemakigozabibozup.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/78cccceb2d7477dd2a1458f1f85105d3/84846358293.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b16f43cf1d---7027099979.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/8acb2214a816167123322b4404b43dbc/sarudelobob.pdfIn PDF document text
    • https://penal-garazh.ru/files/xemogiwajekafufipo.pdfIn PDF document text
    • http://szm.hu/userfiles/file/6676707189.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/98343303939.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/vikatopuwaxuguziwelod.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/05ba2f864c86063187ad55bb1f942da1/bigejigufumodukabulimezip.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/84140342362.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/56216775453.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210901150333.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89ea9f26cf---sinanagiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=bilingualism+research+paper+pdfPDF 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_off00011093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11093 11004 bytes
SHA-256: c53e70c6699b2faecc96fbb399dd8a083f0e101cacdc00c9baa1d77e30a12152
font_01_sfnt_off000129b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C4 18092 bytes
SHA-256: dc1aff5fe70c2e9bb1ff6621de2aa241c9c98ebbb4d2cad0ed5e673e9080adee