Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e45634955cc91fe…

MALICIOUS

PDF

73.7 KB Created: 2021-09-08 11:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5f4ae938fb14eda701b90c886a85aad6 SHA-1: c46b6b7550776b3b18a33279a8d5a5860eaf2bbf SHA-256: 5e45634955cc91fe0628bdfe50bc7e9fa2ae797fd059923e6389052244bbdf9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate effort to create a network of links for SEO manipulation or to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://lovelyspa.net/ckfinder/userfiles/files/nojafepu.pdf In PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/lepek.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/fajunavugaberimij.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/93014152457.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/7bffignobgcvesf03asc60jc6p/9337413380.pdfIn PDF document text
    • https://aedwea.com/upload/foto/watedoxunozujufajaruja.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/99082lqgpi295vmsdpoe9pfgb7/gaban.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/a6acb6a63ab100a746c82837e93bb0bb/tibaj.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/642b395cd3cc07f984b141d8e390c848/64025583602.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/mt09dgl0fe3v2lhjakdvp2htg3/kenozejidupijezob.pdfIn PDF document text
    • http://614move.com/clients/4890/File/16304052387.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210608_5C8079BAB9DDF83D.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/hpj30g35v11pakce059en87hmu/50851502550.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/de1b0175305bb3e0eff6259dab050395/26410761628.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160755d13b4549---lisonewamarimaditorirur.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/10013812170.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/68645078487.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad53798018---59699261088.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/51741009591.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/35522152626.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/80340111996.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7fd61550ab43f100c16a8428cdb83806/kavapamukibuxumadoturew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=arrival+of+the+birds+spartito+piano+pdfPDF 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_off0000bcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB4 16972 bytes
SHA-256: 5de4277c3c90286a439683d2bc3196e71de46730f69501959fddac04861eaddf
font_01_sfnt_off0000e8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C3 10784 bytes
SHA-256: ccf2d822cb02c1b67712f4a5b12e0817668788ad13ead9efb10fad87769917bf
font_02_sfnt_off00010152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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