Malicious PDF — malware analysis report

Static analysis result for SHA-256 7403bb5b37c50339…

MALICIOUS

PDF

86.2 KB Created: 2021-06-26 15:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca41bfbf3abdfd6b545b424ad9d196be SHA-1: d1b4d8a5efb0acf643cc6f5d569a062a34055c3d SHA-256: 7403bb5b37c503396e5941710be8e7da884ef2a17859fa4085be919dd4b917af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4eebe89277---biwetikowatafasuxamata.pdf
    • http://aarogyamedico.com/userfiles/file/nolatumekozu.pdf
    • http://aaykpn.com/uploads/editor/files/tirorujo.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/81ff94763cd00e2180233f11f3be9196/14035638809.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31d76c9aba---60646703065.pdf
    • http://bettynblue.com/upload/fck_img/20210514/file/daxatelodopotesenidavodur.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b6b29c9e3---gipozuwajabonodakizo.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/4p5nne11t4e3f5aah2tlbu12eq/gifabikuroperomizir.pdf
    • http://vivaibonomo.it/userfiles/files/8862465043.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf84ec4907---duxofuwefagu.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4c61b10ad---noxofodevazosukud.pdf
    • http://teckim.it/themes/userfiles//files/zesoxidifuzokupifug.pdf
    • http://boeschfamilytravels.com/clients/43210/File/82328618375.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/9dc764eed18aef863199d3ffcfbb3ea2/balexiwa.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080a4b8bd792---41939984278.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2435573acd---85327521027.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f98fb5f1c5---89012557020.pdf
    • http://xnucleus.com/members//member_images/files/36228427060.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/ceeee35cd92d3d3cf47c6e71f278d3e3/gokigemodiketoronavosev.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160989979935c8---58169134603.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/12068phph1v2ildfd2rhuk2hv3/52599916230.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/2cc3175446a1e86a567d70660d3e05c1/99018036986.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073db281729b---39922990814.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c911210a1d7fd8bcb1553bc24b7b7480/monidimovoxul.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=class+11+history+guide+book+pdf
    • 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_off0000ee79.bin
61294cc8082431ef08e9e02e28c25b2b49e7c9a154d020f7dd1ad8cfef7b7d66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE79 16660 bytes
font_01_sfnt_off0001199c.bin
28b5968e85710bc089c9b6a78ab71e46af3f0d81352fcab639c6720ec244e3a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1199C 11200 bytes
font_02_sfnt_off000133a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133A8 16792 bytes

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