Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d5c966a424ff98…

MALICIOUS

PDF

96.2 KB Created: 2021-06-26 19:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 374e022be8e48968831dce6574f096c6 SHA-1: d0e311fcc92073d4f5401858103a6f7eb453045e SHA-256: 82d5c966a424ff9851fdc15e9c0fe5b7a512cb0ef51d6a05b7246d81c7874381
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to host malicious content. The PDF structure and numerous external links indicate it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160771ef1a450f---38427876191.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/0128c85b675e72026a4bc0087ddc74fc/86053791450.pdf
    • http://www.annaleehuber.com/content_files/file/2402605498.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/15ad15dfdd6be35f37c6cd47f361b149/gumosur.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/c4hfqtmppj9r71l99prp2utamo/suvasofimezuwibixom.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/44f6c3084bab24bfcbd8ec64b541b94c/gesafizelazetoxeto.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16091aa5f10eed---vitelanirurenudewil.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/a0b4a3d9048c0122c787f2e335df70b1/xaxisigokowogiseba.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/59ajv3vnp47ob2ile0hp3j5pu5/84455001736.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16086e8195cea0---13606283562.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f69dc6f303---raraxazem.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc3511008a---zufotupifonopuwerikixo.pdf
    • https://creteotels.gr/FCKeditor/userimages/file/54250930247.pdf
    • http://jatyn.cn/upfiles/202105/file/1620867455.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/fdb2t7cv4ce79pumh1hlfbcg2i/kunufamigojawuwipisifaja.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75a3842792---nuvikup.pdf
    • http://lysfyyy.com/upload/files/68873484741.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/f9fed076e1c42f0242f937ac33528042/bapukog.pdf
    • http://vipnjl.com/userfiles/files/70633204860.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/9iu4q79sfpogjrcsj2tkljeoc3/nunoraz.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/5acd8b581e8b3c813e9af47be1f41c25/66936946541.pdf
    • http://ibshop.gr/uploads/_uploads/files/garamudedamab.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c129d625bb3---50121127130.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=too+much+parathyroid+hormone+will+result+in
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001111b.bin
8ce5bf4f1622ff05c6a2e75e5537b9090254c08fd4a10c01fa32842ae9299b32
pdf-font-stream PDF embedded font (sfnt) at offset 0x1111B 18212 bytes
font_01_sfnt_off00014169.bin
4152c502241f454155c8a75d661e2b5cd387d1fe13195d79d31bac08384d9377
pdf-font-stream PDF embedded font (sfnt) at offset 0x14169 11044 bytes
font_02_sfnt_off00015b09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B09 16792 bytes