Malicious PDF — malware analysis report

Static analysis result for SHA-256 da747456992366a2…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 00:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f06c793e7fec062d98b9f069597f718 SHA-1: 413298b3857956d892bdc0432f0773332606d608 SHA-256: da747456992366a2e1ca864eea654daa0f42bd214e7fb0a9a515b30089ca28a7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains identified as disposable or compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://duef.ru/public/file/videzexinoxukukozel.pdf In PDF document text
    • http://uptownherndon.com/uploads/files/13409815910.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/lajoferoxiferopajemota.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/22887220711.pdfIn PDF document text
    • https://egca.fr/userfiles/file/samezoserosag.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/jegowudurirepobozodod.pdfIn PDF document text
    • http://bushurov.ru/images/files/37494547964.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe6a365074---bavedumadutukojaz.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/98975014954.pdfIn PDF document text
    • https://777mto.info/contents/files/21616305544.pdfIn PDF document text
    • http://budropol.de/Upload/file/motufiranun.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/93425956050.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/3192638286.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/6286251205.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/03191cd2de2b76e2f8876ab8b390f1c2/64213553084.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109110103442387.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/dabirolebobodilamu.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/84552164855.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54359324234.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/ce8c9ddf35899a15b7105123b0522870/84131742729.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109262202283675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=quiet+and+quite+in+a+sentencePDF 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_off0000b236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB236 17396 bytes
SHA-256: 4d57b418c24935a0038a69c9bc4daa678c698e13a40eb6c8e8e6aa4e4747ae1e
font_01_sfnt_off0000de23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE23 10400 bytes
SHA-256: f306fb1d889355d77b8514bff1a4fc95d8a404e11b52262c0606700b49c2d094
font_02_sfnt_off0000f5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1