Malicious PDF — malware analysis report

Static analysis result for SHA-256 6883d1443be3d668…

MALICIOUS

PDF

101.4 KB Created: 2021-08-21 00:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 591c04530514aca48504758928791775 SHA-1: 20865f3a9ef40faea31003e3709b91bc42223245 SHA-256: 6883d1443be3d6686482f4484623396829c6607d836b0307f2a300200d760ccd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URI heuristics and the link farm detection further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://krisoc.ru/uplcv?utm_term=dopo+double+power+7+tablet+reset PDF link annotation
    • https://securityguardsupply.org/php/uploads/file/97451062672.pdfIn PDF document text
    • http://brlairport.com/images/file/jirakonenuluguzud.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119ba5622df4---10025674223.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e9f6095f2---jigilepiluzaje.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/djm8cb92s8dbogju5j5rnc6d08/56319599144.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb565678b4b---dupuwa.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b6edcc2df6e---23223195719.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c0b1d7930e25e8aa0ba60d77f346a722/rugezipibofujenoru.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/wiriparurar.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/xopiva.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/sevafokiximoduwu.pdfIn PDF document text
    • http://cwesp.biz/upload/file/nupezumapavojafof.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/gilobe.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/29528144874.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/u7l14io93hgnd9ck1sjbqi1ot5/senabifela.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/e666c9b4ed4ce91d6d62977bccdd2101/13344695363.pdfIn PDF document text
    • http://rld-carbon.ru/file/38277709693.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/82468251034.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/wogaboxiwifogurof.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/97961259949.pdfIn PDF document text
    • https://ckmandarin.com/uploads/kulesikenafozelajudi.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/dadibunobukupe.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_off00012085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12085 1760 bytes
SHA-256: f2f12d9dae0a25a91ce963cd16eb16c8fda0d1f025f48d53bae2261ea95aab54
font_01_sfnt_off000128d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D8 17152 bytes
SHA-256: 68960a5869ad77a442198a58df4ce12af824afb65e7c3a7044535793c4c84abf
font_02_sfnt_off000155ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E06 10568 bytes
SHA-256: 12c3e8463efce5ed592d4006250dd962675dba0cedb8c6031aace8db8d83eb83

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