Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f40168704200b6…

MALICIOUS

PDF

83.3 KB Created: 2021-09-13 10:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 367371f8812e4c55558f62ad6f6a860c SHA-1: c4ca9d2ddd531fdeb84012570b008736000e6371 SHA-256: 98f40168704200b6ed93d1ed26b1874b8996b21db310896b1908392bdd99c0ef
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://garglob.ru/uplcv?utm_term=tuscany+villa+mod+apk+latest+version PDF link annotation
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/67745359580.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/79441963614.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/nexokaka.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613199ff64cec---nadivekiso.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/6920501365.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/jedusaxawebugovuxepejiz.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/losejojobuxalu.pdfIn PDF document text
    • https://sapporopools.com/contents/files/mojetaloxowutoxufuzovepa.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130209a837eb---21198999588.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/26465207910.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e751e85792---96893251758.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e03afa8c91---19217011848.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/23125100759.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5ee4c3cd6---99784236691.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/wurarab.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/xigugunaxemevuruje.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398d5f30a30---nixeraz.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/80204575931.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/tiporaxunoxaneduj.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/30379574638.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/vozebumodegirimo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EF 17232 bytes
SHA-256: 95444279c347334aa18534591d5e373d202d387cc05d48c32fd23d6f9f612ad7
font_02_sfnt_off000126a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A8 11012 bytes
SHA-256: a4992626fc4dc5c0d8e5ebcfdb778aac82fc3095278a3d083bf922d4da070a00