Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf557dff458a6e87…

MALICIOUS

PDF

79.4 KB Created: 2021-09-20 20:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 26c90fe7b1bd9a79480a692050c7e80d SHA-1: f69aef8e7dd94d7e96d249279a4895d02937b182 SHA-256: bf557dff458a6e877ebaa79172d1fa03c357697bd7b6ef90d6283f37f9351da2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to multiple external URLs, including compromised WordPress sites and disposable hosting. The primary purpose appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://drafthe.ru/uplcv?utm_term=san+andreas+game+download+mobile PDF link annotation
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/lg6pk6bhrs5mljjiccnu493n37/16760956014.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/49328787212.pdfIn PDF document text
    • http://timebymtm.com/upload/files/12548922836.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134516cee8ee---5938771207.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/46171328546.pdfIn PDF document text
    • http://sparkpro.lv/content/file/xuzivowitinoxuw.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/80167542234.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/70437266026.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/84139311323.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/7841493201.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/safilat.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/lakupiwi.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614631f7d93c8---puzokafixorolimawes.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/995732805.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/gexunozi.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210911_121301.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/81624802164.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/pejaf.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/33541673191.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f88a126df9---wipavozupoke.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/36189311582.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/bawoju.pdfIn PDF document text
    • 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_off0000d2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B4 17100 bytes
SHA-256: 79b9d09e62977bf3bd5b722c43c34f070a91ea257419cda14c8ff2fc07ebb747
font_01_sfnt_off0000ff4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4C 10796 bytes
SHA-256: 4e5faf36620f8668b9600b28ac1af8a8da6b8f7a62d18ea74ca37b96a3626570
font_02_sfnt_off000117ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1