Malicious PDF — malware analysis report

Static analysis result for SHA-256 27064a5d8de274d7…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 21:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a59274a748681cdc426b3649f0596ee5 SHA-1: 1d7dd17731b58b84fbeae340fcc825b7fbb29453 SHA-256: 27064a5d8de274d76edc2b59af68e9635f6ef8736c29aa9539a972f291bcde5b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs, many pointing to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The use of compromised CMS upload storage and disposable hosting further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://inwebjor.ru/uplcv?utm_term=los+girasoles+ciegos+alberto+m%C3%A9ndez+pdf PDF link annotation
    • http://workcoop.org/fckeditor/userimages/file/20210801134548.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/71330250659.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e42e4b63a---budibefubatibiliwedi.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa64f90408b---korigefi.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/89fe1d6fd10678c3dd47234644e774c1/tanar.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/cc2jt4qruiimg0d8f0h5abpqo6/37859922848.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f086bf879---muxezagojimidusa.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/kameli.pdfIn PDF document text
    • https://durimawar.com/contents/files/74000096697.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6be6bbd8a---69926495083.pdfIn PDF document text
    • http://yulintimber.cn/d/files/83998107815.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/gabadulam.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/jurumojifapezazineva.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/85967129549.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5f30ffc23e022c70f55d02ab5fca659e/71855996263.pdfIn PDF document text
    • http://teaneckhs1977.com/clients/67867/File/xosetabivepileremu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4jncgi731h626g5m71q7ldijsd/70625643698.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16110e7598f7cf---debizuv.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d2c3a4fd2---lamoga.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/37162327473.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d16970723---28990080012.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609c445592b08---79751699070.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210825043109946.pdfIn PDF document text
    • http://billsky.ee/files/file/wamopujofomutowexewubo.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f499cb9e3---63699150631.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/fibex.pdfIn PDF document text
    • 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_off0000c9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FA 19848 bytes
SHA-256: c2b9061f18d4e924ba1678c02c19090876fbfbaf190fc6a8c061440e90a3b12e
font_01_sfnt_off0000fbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F0 11272 bytes
SHA-256: fbbb51fabb878e92cf044ed7c434580028acea61daea60c08d14721ffc3bfe64