Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d1cd027f75b2ef…

MALICIOUS

PDF

67.8 KB Created: 2021-09-25 03:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 043758da1bf5f998ff4e9c6623cbdfee SHA-1: 7fa14083d91eb2f4a2e08db493f3fa2859c96a2b SHA-256: 39d1cd027f75b2ef0bd59ae530b5497207a9ce29942c4a41bbacf856e494d826
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and is identified as a phishing lure by multiple heuristics. The document body is heavily obfuscated, but the presence of JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, strongly suggests it is designed to redirect users to malicious sites. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://recviem.ru/img/upload/93568041186.pdf In PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/74508329447.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/92145318994.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/17160108526.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/zajegiwowudiw.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/bupipopazuvuvegujinodoli.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16130de5163aab---80424132701.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/74260016331.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/pipewapud.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/matepubofupanopivo.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/5678788821.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/rifiraxiwulaf.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/7647706587.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/kivukekesaf.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b68dcfc2d---bolodekizozefeku.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301254e8ff9---rinugufefofuno.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64125913855.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/zozuxuwapirakiwo.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/52779812073.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/11150123025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=black+panther+full+movie+download+in+englishPDF 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_off0000ab95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB95 14272 bytes
SHA-256: 2f3cb91a81d34e87668713dadc9bac11ffdc9ae987b30699b4fefa74fa1026c9
font_01_sfnt_off0000cf32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF32 11464 bytes
SHA-256: f01378243ce91f3bfd67fe019fda61058c7b43aa8aa5dc425762c35e512b7e43
font_02_sfnt_off0000ea01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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