Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63c7fb50c008086…

MALICIOUS

PDF

94.9 KB Created: 2021-08-03 00:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4c6e68477ee3c4275e54f33920495d8c SHA-1: b918e206edd77cf15aab7887f8023fc0c3bff177 SHA-256: a63c7fb50c00808651d43f9fc4385ad372ad4a88e3dd637bffb6874a830a38df
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it's part of a phishing or malware distribution campaign. The PDF structure and link farm heuristics point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/0737dffbffe6e6c796f4f148cfb02f1c/rimizev.pdf In PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/bq7c9hjli3dim0is7uck630bv1/2649454884.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/1c54d09d46ca3294b24e89885b3cf6b0/bikubezutovedogafugutal.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab8efcd4e3---15439120967.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/dead1de5989f5a85a39cd37f8e2adfb8/56541879828.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/83804584334.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/lafogebum.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/55661961960.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/jusofovegiwetedavuxodiduv.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/77436222835.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/vawanasitagolugag.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/moxokapemapes.pdfIn PDF document text
    • http://pneusmarene.it/images/file/salanopiluw.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5fc67ca14---57750442704.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/bvss519vvemobtktagf2hjq4ba/gabirida.pdfIn PDF document text
    • http://idaskitchen.org/clients/d/d8/d86ca706a5600d452cde81e4a21b2d68/File/tojavawesod.pdfIn PDF document text
    • https://andhimazhai.com/images/files/59076591623.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/au1mgblhdbsv5bcs0lflpbg9f1/58419750929.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/4b568a49f9ca34bc99c6f3143e6b780b/6795003961.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a643629682a---fepawokiteguwifaged.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/de24ff7c02c7cb5862b0631f5e94aee0/pabisafaginupukenedufiga.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/fizeromogavu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89de94b0f---21887197144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=quality+inspection+checklist+template+excelPDF 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_off00011023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12835 16864 bytes
SHA-256: b097cc4afa97bd9096684f588fc83c3c508ad6936ed538966247a1a4ef5ff5b8
font_02_sfnt_off00015435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15435 11004 bytes
SHA-256: 103210f6bed19e7b8873057eb4533307783383b9856502a2377a591fb82e0240

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