Malicious PDF — malware analysis report

Static analysis result for SHA-256 d336fb2196d639e8…

MALICIOUS

PDF

71.6 KB Created: 2021-09-17 10:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c7124c6e5dfd4d0fe77b547a6e4b6ba2 SHA-1: 86664a58fac75cd1f3530d4bb684fa195e3a6fb6 SHA-256: d336fb2196d639e89ac824778457eb91f2a6f9087af6c493d058e0ed03a2323c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://aptekarynek.pl/zdjecia/fck/file/75663125130.pdf In PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/18a0b9b2e4f07d772765ddaa5fcbc3b6/zebukofunikadowilewolon.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/nogadopomedumiju.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/gidonitagamepisivu.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/88131019747.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/wukuwesalunaxefa.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/76529365208.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/92733693265.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/merowirizusanopobaweririp.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613376713a24b---melogixifigepezitoxij.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/kotovemu.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/170023317131.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/zamefimo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8svuu2q8geim9but3u423lkmc2/bikixeduradunetom.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210905032948_01w44k.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/ec6b5ca7164f855e1cb6265b3ff61910/kefudexufemofovibixopu.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/eba197fbf681249600e13eb3ac5d6106/buzuk.pdfIn PDF document text
    • https://cathita.vn/upload/files/kadurog.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/51023299310.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/16696649069.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/fufukesuwavobemuvavopa.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/zexovomuvo.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67d2a874b140ac51977d57d80722aced/75441969906.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/bakoxuvegevepepeke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=gta+sa+android+logoPDF 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_off0000ba7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD290 15452 bytes
SHA-256: 1606e135bccf86a9b4255ac2066daf78b950b85145cda8a947a4177d979c35db
font_02_sfnt_off0000f9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EF 10328 bytes
SHA-256: 386b66eae6542d56f4f8d7214d790f702027b9138a9d729312e189d997b72b5b