Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b2c8cd56e42fc0…

MALICIOUS

PDF

79.8 KB Created: 2021-09-20 11:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 66342221230f04a2f12a9f5812e38cd7 SHA-1: 7c942d6df85df569abd19aaf5ab453081acb73d4 SHA-256: b5b2c8cd56e42fc0d5e98e8b6115c4fc320b98bd1dd3973c45d1e94678266be4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The primary purpose appears to be redirecting users through these compromised sites, likely to deliver a phishing page or a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/0503e164618424a510e96709e4dc3c31/31923726994.pdf In PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/80623978562.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/75636566978.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/kawole.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/vunaridogegebulokovegev.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/ferumudinapabopu.pdfIn PDF document text
    • http://ciatic.saintelserver.com/archivos_editor/file/86108506687.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa4d05fcc7---tasugunoposafugotum.pdfIn PDF document text
    • https://unitjaya.com/contents/files/nomabemej.pdfIn PDF document text
    • https://ptogel2.com/contents/files/xometuduwodakovosonewoto.pdfIn PDF document text
    • https://aokman-drive.com/d/files/kavosidizasafuvopipeda.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/72964886256.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/niziwesagaxozuxabidewebe.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/jugikowusapipotowik.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/degib.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/54209221977.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/70141771567.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/gaxedopimo.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/gebepadujare.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5fc6d0878286734d79e45076e8324792/55051534126.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/vafiwebomabegilifagipaniv.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/sunogebewogelud.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/xuwijadovimerot.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1631485686.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/32674957928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=nintendo+switch+emulator+for+android+2020PDF 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_off0000d13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13E 17536 bytes
SHA-256: cde6e10adda1ec14d256d095c3b307fe482fecd10e5bb0d87a98d4c08ed61972
font_01_sfnt_off0000ff3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11753 11144 bytes
SHA-256: f3f80ca558af3d0a77da8a99f39373814fbbe3fbe2341ef638dfb47521f86ea5

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