Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6289c8cf81b4cfb…

MALICIOUS

PDF

84.6 KB Created: 2021-10-08 22:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 55f45fcaba06a69eafbe6c68967d856d SHA-1: fbf08477d28688a07dd2840aec25bfae5473b49d SHA-256: c6289c8cf81b4cfbc1ed2c92c1fd68c9ce0f294f5e7a5e94cc555f4f3f9ae7a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the compromised hosting infrastructure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://infrive.ru/uplcv?utm_term=chicago+formatting+style+sample PDF link annotation
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2fde14207---xoroxidejo.pdfIn PDF document text
    • https://chp-travel.ir/data/file/3900778749.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/dunas.pdfIn PDF document text
    • http://speckrepej.com/upload/file/93920450302.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/sumeravu.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16138e9d9a8e47---faretizalalu.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161388bd167b5e---29520504504.pdfIn PDF document text
    • http://fpole.ru/sadm_files/welizifopefodo.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/bipibovokewesupina.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/42280605838.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/dudemokev.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/74624709731.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/pijusalezituxo.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/meralikodotugotu.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/87024426145.pdfIn PDF document text
    • http://iknow.pl/files/file/23312450705.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161376b46bcade---lemif.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/fawoke.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/rasilitinivep.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/84554235511.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/58620906100.pdfIn PDF document text
    • https://spacio.hk/attachment/file/kodefonizanam.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_off0000e05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05C 19520 bytes
SHA-256: 9147b5903c05633b65789ca7acb747ba02187cb438e5167f689fa877b8be5f13
font_01_sfnt_off00011312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B29 11072 bytes
SHA-256: c92e98200bed645e6951695a9cac377e90ba172cbdb0bc13e4a3e098d8c94cad