Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbefd3e781fa5b6f…

MALICIOUS

PDF

94.2 KB Created: 2021-09-02 19:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc62646e74d1dfa3f7b304ca118b7b8d SHA-1: 8b9138fa1b1d02bace6e00e314a26c8a0a2165cf SHA-256: fbefd3e781fa5b6f191e2b17d1514548e4b6f9561279d6647ebb0b6ca9f37620
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous extracted URLs point to compromised CMS uploads and link farms on disposable hosting, indicating a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be metadata from wkhtmltopdf, suggesting the PDF itself is not intended for direct user interaction but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://nomylo.ru/uplcv?utm_term=scott+voltage+fr+730+manual PDF link annotation
    • https://maggies-handmade.com/UserFiles/files/94984442428.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/fukuwalise.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/29524936058.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/43220236217.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/2df39a3bf3c784c285e18b335d1c3157/79997665917.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086efdacbe76---xonajuzasa.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c405c1feaa---45395684004.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/2618713da84f6e34ba0896ac5d6f37a1/57014457707.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/risuzusepoditaboxu.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161192a5b561cc---54849793292.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/95583967652.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/6882e49dd245ab37ca4c48ee00b7c4b3/bumow.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/8575622627.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/47193660833.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/80808747835.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/636bc7c94fee3ef1cf45c01f406d72a4/3518206448.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607eddef2fe00---zupikemurekomuzupogi.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/87479821236.pdfIn PDF document text
    • https://topupdana.com/contents//files/72660457335.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/2d9734cd6b5b40d7fedd05e7253a1914/94560690413.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/6042837290.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/94719222880.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/pesidaruzivod.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0B 19892 bytes
SHA-256: e452286448e1d60e8b4a9296b7764ed5fb1e01fc54cb8e855f5bec5f7aeed40f
font_01_sfnt_off0001235c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235C 11004 bytes
SHA-256: 319f156cf64be7ac24006bca53ac3b92e987e5ea378ae9d94210e096d7591652
font_02_sfnt_off00013d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15527 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1

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