Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f4e0b995659f12…

MALICIOUS

PDF

181.9 KB Created: 2021-08-23 10:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2f04f1a2f3e8ecd4c121baa37356ef40 SHA-1: f5140d2412fea686a95f63ef57e3a94194a659b8 SHA-256: 76f4e0b995659f12a9672474e2e61e7e4792c7054c6e1b860ef271b5f134950c
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection indicate malicious intent, likely to redirect users to phishing or malware sites. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9242

Heuristics 5

  • 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
  • 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://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089ca5a26de3---48165059871.pdf In PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/dbc22524568bd8d7d46897ab7ea3932f/wilix.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16073a6e540a7b---nobuge.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/97223143586.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/77d1e6bc02b1b11b8b0ecb7801c6b162/55459357362.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/bac5b801a47e38c0ad1f2a71d76159c4/wuwetofivixijobel.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/69975417600.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ce90a053d---wavuwapil.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/sewan.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/mitelewirexugixuz.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/67634294015.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/kemom.pdfIn PDF document text
    • http://hkalc.com/userfiles/37867708953.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836d717d1ac---84359053316.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/salaxebemopawano.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/mn84aq2r40l1f1k8m3jjqdoe7f/31981354922.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/qbpg73ph26jjbn3ab7gl386ng7/42464291462.pdfIn PDF document text
    • http://24cvety.ru/upload/files/jefugisuki.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/f08da197757ddca97d00cc4634727404/navujutujosufavefafibudit.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbc5dc0a6d---losizada.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/b6e78aadcbb69690e037188ce7a0c107/17888866287.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/lizuwu.pdfIn PDF document text
    • http://zerosquareonline.com/file/3832446617.pdfIn PDF document text
    • http://aimic.com/userfiles/file/87092034772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=3+signs+of+a+child+psychopathPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00029431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29431 21644 bytes
SHA-256: a46b7473be19e16cfa43ad10fe11fe4f3339a82de552ae849ee6a9f9ee705691

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