Malicious PDF — malware analysis report

Static analysis result for SHA-256 7adf9480cee8a2e8…

MALICIOUS

PDF

86.0 KB Created: 2021-09-15 22:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: acbf7e83425f5fb7a8c1920f9da417d1 SHA-1: 9c30b8ad5c8c69c54779bb65effce1b573add2f0 SHA-256: 7adf9480cee8a2e8cf5a4046d0a744a7eccc9c6353a948c7b85f7bdee1403355
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://avvocato-callegaro.it/public/file/95535700589.pdf
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kotutilevokimin.pdf
    • http://pankajplast.com/ckfinder/userfiles/files/duretipadog.pdf
    • http://esenkardeslerinsaat.com/resimlerfiles/37616894420.pdf
    • https://servauto.fr/img/user/file/28559002120.pdf
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/dupoboripadak.pdf
    • http://mini-garden.ru/userfiles/file/nozevuketurukibeva.pdf
    • http://appinaris.net/ckfinder/userfiles/publics/files/17599222695.pdf
    • http://clinton.abwingsmd.com/uploads/files/80421053798.pdf
    • http://mgtofubbq.com/uploads/files/zozonitomo.pdf
    • http://csp.hu/editor_up/bibuweras.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/vkqrvk5mst2icaan6291r76k4e/wekabazexafaxuroji.pdf
    • https://dcimx.com/files/52630421385.pdf
    • https://ev-owners.jp/userfiles/files/7122314742.pdf
    • https://gosselindesign.com/images/from_fckeditor/fichiers/75812975730.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/f3001a82c0d3c992a092d72384ccd28b/lakofizuguvarukedevanased.pdf
    • http://intrinhgia.com/admin/webroot/upload/image/files/57479181620.pdf
    • http://eegbiofeedback-leszno.pl/userfiles/file/96207811185.pdf
    • http://www.dean-cpa.com/files/adminpic/file/29341950039.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/7pas6o5l4bighgvvjvsuhr8nl0/mafotitufi.pdf
    • http://tc-antey.ru/uploads/files/mimigetupazi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=abstract+algebra+dummit+and+foote+solutions
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e751.bin
5600dfd631b821bbaa64f6061f3804b889b59faea534887bd2f42a8e4972cd2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE751 11040 bytes
font_01_sfnt_off000100db.bin
46304b767897f34cbbfd4c421d0f1f68666c98f4c49f9590f5348fde9dd35a28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 18664 bytes
font_02_sfnt_off0001323d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1323D 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.