Malicious PDF — malware analysis report

Static analysis result for SHA-256 37602bd6d3e182d1…

MALICIOUS

PDF

78.8 KB Created: 2021-09-24 20:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f9a3cbd22b29b288768423834f749f8f SHA-1: c01883f3d9674cf954ce4b0a2c57541f7e2a2827 SHA-256: 37602bd6d3e182d121f5c5587dfcb22853f4ac2932e17ffdbf15d99ce0356e2d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various websites, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to download further content, potentially leading to a malicious payload or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/0f2c2d0ba3f382da29191d839eba1b5a/49665417368.pdf In PDF document text
    • http://hyosangjo.com/userfiles/file/20210910030742.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/bupevizuvopevejivegojasiw.pdfIn PDF document text
    • https://ipkameros.lt/userfiles/file/jilapobakavunozifup.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/7e5bfca43cea9bfbb3bcd31f4a516bc9/92059299031.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/zemotewifo.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/vexuvu.pdfIn PDF document text
    • http://it-hair.com/userfiles/51996893288.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/9047895605.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/pasewusilabajemikijomezu.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/21341315166.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/wejiridovanol.pdfIn PDF document text
    • http://teakdeck.pl/files/file/9496400023.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/598535365.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/pebewuzigatin.pdfIn PDF document text
    • http://fruitsad.pl/images/file/85479611191.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/pumiluguziravuwufemov.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/78919451339.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1e7d48d31---xomuje.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/gipij.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c48457a4b033ea29a214e5e528d14913/lajoviwesozoxekaleza.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/1700315998.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141a58ad9685---tisatobodutimelalezug.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/61357032914.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf3d36e0d---bisoxozasoki.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394480c3764---bafekad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sanam+teri+kasam+full+hd+1080p+downloadPDF 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_off0000c453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC453 20464 bytes
SHA-256: c8befa4e62a27e197e6dbfaed9bbcffacd04240fa019b6544772d96da54822b8
font_01_sfnt_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11268 11496 bytes
SHA-256: e185e3c8ebdb1c3d6eed39344fe8b5a66b9659664c376d818475bf1c27e26246

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