Malicious PDF — malware analysis report

Static analysis result for SHA-256 2308ca6735fe2d2b…

MALICIOUS

PDF

103.0 KB Created: 2021-07-28 00:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: aca7c42a83e1bbcf39d53afe8e83be49 SHA-1: 44429b54d2c5d8697e86c6b28b7cd179a4841862 SHA-256: 2308ca6735fe2d2b0330bd88a1b06b6ca0c48f6a485a3e71357d3f135d58fac8
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised websites, many of which appear to be hosted on disposable domains. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm designed to direct users to potentially harmful content. No scripts were extracted, but the primary attack pattern is the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 5

  • 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.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c974e012499---8833315275.pdf In PDF document text
    • http://emusicmarket.com/upfile/board/files/33826038605.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54586790037.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/2583eeac191a32a808e173cf31f96a6d/82184253525.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/36362723738.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/41673897018.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/q9c4gla55r1mr0vqiquta05e11/92097573989.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/taguvosovaxanedix.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607289a87e008---65605987871.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a944669a354---47221322463.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/fe4bfb97b74a9a6bb8c195ba2b076958/11675334752.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f5fb9990ae044fbbf07f42bd6e5e166b/govuwogimeto.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607104042ab7e---rimibedakuwirobotufid.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fc2f6ea1afa---99928604577.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a494d95b2---padorunurerafe.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/sn7cr0m2t1at0pk5get3b7gduh/8169361788.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/43706385138.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/76460303710.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf86d77524d---vepuzulasowupekili.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/54125347053.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/pifememi.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/96886228258.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/40580955475.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/23118660369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=abecedario+en+letra+script+may%C3%BAscula+y+minuscula+para+imprimirPDF 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_off0001253c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4E 20728 bytes
SHA-256: 09d9de96dfefb3083ff83988b1e22dbbc7b6f2983e1de38ee38843a4f1e1a218
font_02_sfnt_off000170c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170C2 11128 bytes
SHA-256: e6a4db44ec5b346297e1a57aefaaf8dc5f44bcfdb94df01fbb4833b44b58b5a0

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