Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5cd85123c6dc155…

MALICIOUS

PDF

94.2 KB Created: 2021-07-16 09:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c546f7ee130c25e1eb1eb71fcc1abed0 SHA-1: d84589f1a125996f163e794beb41a091ab4bc9e4 SHA-256: a5cd85123c6dc155e810744f870c4bbac0954c034dd1d330d8acce9efb07fce4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/q587iegak8nr2qknjqi54vb2nu/89162318146.pdf In PDF document text
    • http://kasaitogo.com/uploads/files/gaditawororaxomuni.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/82061564228.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/62310136475.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d58e7ce34d---10623111806.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607348735ca17---84689681902.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/noporekodumimivawuj.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae42b1141dd---gesizuji.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/kulanamuzaguzupuxita.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16095aca343605---7550812427.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d50c6670b40---86334782974.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/60382641244.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/d04fea7f5c81e9de1369643ccf428693/pivovipawul.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086be63f4195---samezuzudekoj.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0f4d7d7352a29f298f094b6d92775092/fuxinejijatiwibegokuwotob.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160940f89ba87d---93148658956.pdfIn PDF document text
    • https://latework.cz/soubory/rabigodugilekolukeki.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/45568082873.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/sazujuwororagupazanedixu.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608bedabef0f8---51634784861.pdfIn PDF document text
    • https://mmszke.hu/files/file/bofebegufopilinefuwez.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad91506cf4---gixoburaziximivadenosote.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/584c117029ad4d55e86b45e4f26c497b/sinaxutazevamikewi.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/08a41e699f6154a6d4afc7766e263ded/dabojapumazinadovudenumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+sims+4+brookheights+open+world+downloadPDF link annotation
    • 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_off0000e9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B7 11196 bytes
SHA-256: 9a89919f2bb0ea203f900d9842556338c54c28691f9114a317f26b9bd36dca1e
font_01_sfnt_off00010363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10363 16904 bytes
SHA-256: 1d8e0458a742df1a6f0d90c6b3e68a4891e054fdcf05db7239ed879eb781d9dd
font_02_sfnt_off00011b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B62 21248 bytes
SHA-256: a8c97a4b89430852c2aaa7e6f0e2f113d831210535419cb1a7e8d1b38bca800d
font_03_sfnt_off000152a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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