Malicious PDF — malware analysis report

Static analysis result for SHA-256 5726e14efd85e1ec…

MALICIOUS

PDF

84.6 KB Created: 2021-09-07 06:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b937ba38a95236f915472f12937fdf0a SHA-1: 091abd880ea52ed04c17d6ac8115ddec9ef1af1c SHA-256: 5726e14efd85e1ec768c2ef359a4c3a5cee875ad59a9a006e766adeff7468633
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The file functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload directories. The presence of these links suggests an attempt to lure users to malicious sites, likely for credential harvesting or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://phuvuongcorp.com/luutru/files/geresaruwagoziseva.pdf In PDF document text
    • http://sgyscom.com/upload_fck/file/2021-8-17/20210817233307792464.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/xezenogeruzezelup.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc066c3792e---42856401169.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/af06122728bd1944d8350dbbe54036e2/paluwaxulukegofu.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/60071040774.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/makitulijixob.pdfIn PDF document text
    • http://k1a.ru/images/files/file/wokusalidujubepabu.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160847e945337a---xixowinavuxeligufadir.pdfIn PDF document text
    • https://digireg.dk/upload/wamefabododoxuneto.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109ee79dd36d---38608088905.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021051709215773499.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/xokosukojesadimadedi.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/14b1cec5218ffea73afd5b2d9a5d5a03/pesiwedevu.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/40490868775.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099de48a05b2---61020259450.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b475b49ac63---gijanimikabagizaxodu.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160839c5b6a6ca---gamopozizereluj.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/newuduvekugaxiweselojuv.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/96708439640.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/80vevcs8e2ft1v9nmoe4rke811/29184295500.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49887b5d95---86614771397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=canon+rebel+t6i+manual+settingsPDF 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_off0000e3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 18020 bytes
SHA-256: e3a919c602a3f87fb8ca0f063892e665769ac6ce41ec3dc16f83a5a5881f9218
font_01_sfnt_off0001122d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A44 10888 bytes
SHA-256: 09f77f2d008098c6d2b361a7e454383ccd584b44de8fe59f2d5dfd7d64f9a563

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