Malicious PDF — malware analysis report

Static analysis result for SHA-256 294ce52d4b94e420…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 22:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 749531feb069aab7548b544831d74894 SHA-1: 8f44f4ec1fe40a93743658832f65cf44bb2279e0 SHA-256: 294ce52d4b94e4204e1f518986317b05af6397a63da0830c56d41a5bb09f3858
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm pointing to multiple domains, some of which appear to be compromised WordPress sites. The primary purpose seems to be redirecting users through these links, potentially to a malicious site or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://varbackaforskola.se/ckfinder/userfiles/files/62670577599.pdf In PDF document text
    • http://daimarconstrucciones.com/images/admin/file/mofam.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614092cc096bd---midojodiwisiw.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329402988e0---zumemewifasonutufigewe.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/35338330520.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/wujopew.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/wajofawixukepezijifogewip.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/6221120220.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145bbd5b99b6---mugoges.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///taxaremubo.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/62552618846.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1631190674.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/bujibad.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff52ae7bb2---janamonigekegube.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/semepusamoxur.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/5120638148.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/motivetavutudaravurakowaw.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/69677416038.pdfIn PDF document text
    • http://snft.ro/media/file/ruresujeluvuriwafugaroluw.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/pijidinexeravopefase.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/79362538216.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/segasomuviminif.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/pigujuruvapanuzapikanimam.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/limesozubibiguk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=game+perang+offline+terbaik+di+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_off0000e072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF884 17112 bytes
SHA-256: 395c9d6047de67dd13800eb93c81b242f6a869e1f2379973691ad762d4d8cd0d
font_02_sfnt_off00012493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12493 10944 bytes
SHA-256: 422e45218a61c1461cd8410a227361e6a6983e12164f9032d1e26149ed976d60

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