Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2bf06630d91470…

MALICIOUS

PDF

75.2 KB Created: 2021-07-13 19:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c74f21e56ce6dfc66e5b6d140e9c2d85 SHA-1: 2adafddc251ac1d15297594a99cc82fb12ab7ef6 SHA-256: 5d2bf06630d9147065918f4ecf2317fe81c4122f00cc938abc5d488aced68531
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of these links indicates a phishing or SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b08930545e---pivijodijukajiziwekubusol.pdf In PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb1c9a0663---87489676566.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/53836e86f4d66753117d03c03b323fea/23674200135.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c22221eb9---24937230806.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/qocdq0lmtbig62i0i2bhjbuj24/dureditidemududatuj.pdfIn PDF document text
    • http://redactron.com/userfiles/file/dijigawuxinuriso.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430200600818474.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9405569ea---90528991089.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/94485683868.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/wovikimuvavotim.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fb857411e---92750081393.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946d7f3afdc---poxife.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095c8cbdcb81---zorafixubitiwerodewulani.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/34693326153.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160733e629704b---17336659463.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098489789035---topidegonafavalawunebuda.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/ratasujabafelozeb.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/gegexozas.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/73074833289.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ca958943a---38932213966.pdfIn PDF document text
    • https://ka-base.no/images_content/file/pafapovejedozizedufow.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/41536704872.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/9a67028a747fb944d801eddea76a8c43/dubipelepuwexisaxulikatet.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b447d7e76---5167802217.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160984086caf37---36600565700.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c8854cdb5---pibuvumiwa.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/0vl6uvf68gecp65oh87tfn8r30/lepufolevajijinopiwox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=emptying+a+stoma+bagPDF 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_off0000c7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE9 10556 bytes
SHA-256: 30292a9e5fbbe62e02c658165b9afea2592bf0f3c9b8018e8a5cbda445ddaba8
font_02_sfnt_off0000f7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BF 14980 bytes
SHA-256: ae90824a355ee6e732e4fbb97cc8710b21b2068ad70d7fc8735cedc54b4e2a8a