Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1fd1d5445bbc97…

MALICIOUS

PDF

90.5 KB Created: 2021-08-11 19:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b829db4cdcafa5e9c2da78a44eef7dc SHA-1: 6d861d3ae3446b25c87613ab0c205c92e40b4d2d SHA-256: 0f1fd1d5445bbc973aa037c21b669a6b77ae5e08c52a8282774df3ca6abbea52
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/56b8ff2bdb9ec0276c34f4e8d5c493dc/96860442435.pdf In PDF document text
    • http://portalpr-b2b.es/img/user///file/_0937020001628230731.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/digoluwazanodet.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/30802691277.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a93a08d842e---buwawudor.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1ea764420---19985084986.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/nopeletiginega.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/suwomawoxitowexebejerobiz.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/31745178003.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/58708066713.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/wubegijawepanixo.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/36531785758.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/9b6a63ad0c53b4887d6dda3e4d48fa85/mupejagegajix.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/bba72a2863760db190720368725e851a/25455500971.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607491b130798---96378299609.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/vokepifedomukaxexoxe.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/xuperorinowebinoki.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071855fdb46a---juvikabixitu.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/87658488232.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b5ae05891---24089108451.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d881233fa3---purap.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/3037d9094ed6c5453b1c925001bd3379/68732564096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=sonic+x+season+4+2021PDF 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_off0000fc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 10528 bytes
SHA-256: b7b8feb65f71ab0762ebbdcbd66aa0690cd958ea4edce2946907bbc51bdbf424
font_01_sfnt_off00011452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11452 17640 bytes
SHA-256: febb9218d972ac521f9a3cbe786577cef9bccd80f8e86467e29b593063ebc844
font_02_sfnt_off00014295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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