Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bba53a674bc2d20…

MALICIOUS

PDF

69.9 KB Created: 2021-09-07 23:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1c7ef4748546c7c566d286bc311064e0 SHA-1: 0c552c0ba707eb78594a05b1b50508c1f0542667 SHA-256: 9bba53a674bc2d2004917290161d39b4a39608cad6817c7e0517ab7b011f8e13
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous links pointing to compromised websites, many of which host further PDF files. These links likely serve as a lure to download additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://architettoangeli.it/userfiles/files/gumato.pdf In PDF document text
    • http://extintoresorigen.com/images/editor/raresexupok.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c84aafe14---32752562840.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9721939e2---mozew.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021060220062749.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/neveted.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/ef4e4fdb9dd8e98cf27ce3fbaa0a13e2/vugosomuzezewo.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/bitbf74au1lg8hl0a4e0bdkasp/97899455131.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/e39d785b2a3084804f8248295c53e02b/92964624024.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/8tgj1u3ddjcnpsl0d9sl1eq3jf/35929180215.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/daxegelorili.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/f46c896e5c2f530bf15866574bc2cf97/59237572611.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/napukixawipulavule.pdfIn PDF document text
    • https://papiratisk.cz/soubory/rixeka.pdfIn PDF document text
    • http://aurora-c.jp/files/files/waviguduworokegadiv.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/bebeaf44257b3859ff77ca26a3e6ba7c/kabufowovatugogovisa.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a818a2c3bd2---67654041558.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210519060842.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/52177826077.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/61813373074.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/38387425355.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/jebibimuvigowis.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/c9bcea670ca51328124d2486f72cab9f/77694899324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=siddhanta+siromani+pdf+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_off0000b36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36D 10792 bytes
SHA-256: 4c680bf55e81e0df0707947f56e5287ba7835d4891226f5cbe54de5bf810178a
font_01_sfnt_off0000cc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE428 15156 bytes
SHA-256: fdef4d6b6dfc46a8dc58fa2d767b160851efbf49e2c1ec02aa47a1a017f14cce