Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f7502312a5e3960…

MALICIOUS

PDF

86.6 KB Created: 2021-09-03 14:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f84f682bd3d8f9ee96d98bf85336972 SHA-1: a12e73fb3ab512d7015ace94e781ee71e286b821 SHA-256: 1f7502312a5e3960fceb5271b2d6afbd2097b02238922379045f6c2754e878dc
156 Risk Score

Malware Insights

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

The file is a PDF containing a link farm, with numerous URLs pointing to external resources. Several heuristics indicate that these links are hosted on compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drafthe.ru/uplcv?utm_term=ibps+po+pre+paper+2019+pdf PDF link annotation
    • http://idcla.net/upload/files/33713292165.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/63390230356.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/jegafomigar.pdfIn PDF document text
    • http://ashioke.com/images/library/File/10600390067.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/mitikedigumaruwarotudo.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/26677455852.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/11072916450.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb02884a32a---15713165544.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/66d2e780fdcc095c3dbb62a5d54ed9fc/34536717526.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bd99f90f2e---velafan.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2157a718501c573b7c246f04d1fb1f32/25561069362.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/na6rhnm3ashev6d42l01mnc361/96211399747.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/eqfvkog88rh3491tmojlm76r6b/91175864492.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/3224356748.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/064ac81c2e0e7c1a01c12f9d622b7dbe/76973684514.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/87554372104.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8eec874c1---xitijizafupobugixusujura.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///22403053212.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2c560a8e5037e9aef3cbe796a47a5ae8/87105552257.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/36837359853.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/jf3ei4es6dnpqhtj3in0j2cjq0/26378099641.pdfIn PDF document text
    • http://katachizu.com/img/news/files/63483379404.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/e4rpvq0smlep8ja7sq884cafsq/37638399189.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_off0000ecfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFE 18164 bytes
SHA-256: 6e0407e0f39ebfb40df8b0e3fb286ead841b140d28fadaa148a92cd3af0fd6af
font_01_sfnt_off00011c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 10704 bytes
SHA-256: ee46510581891bc161d4c163c9a49c8b0fbf4c36546f1230df637b97cf80b20a
font_02_sfnt_off000134b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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