Malicious PDF — malware analysis report

Static analysis result for SHA-256 155c12975a8b9304…

MALICIOUS

PDF

88.2 KB Created: 2021-08-12 11:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c5535cdece063cb8b125df169fb87ef SHA-1: 6f300ce082179d9b10dd127d5608acca6173ba9a SHA-256: 155c12975a8b93044f8d1eaba0962d3a3c57adb0a933ea75042595c1b2b5a9cf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed for SEO manipulation. The primary malicious link points to a PDF hosted on a suspicious domain, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL patterns indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://airflow-skateboards.com/userfiles/files/44658456545.pdf In PDF document text
    • http://sumterhigh89.com/clients/863574/File/zepubinaragineguleziw.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/32557994864.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/rirujopudokateb.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/c78ff9960f164cfbae1b0fd537d6c7bc/wuxepe.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/61621319395.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ed971b79784---pubuxavodidozo.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/12703886244.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/ratofakibon.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3hbumkl7dg8hitlesn1bqfr2f1/nupadulo.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/gevijonutupesiruxerudafu.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/foxox.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gamoxobox.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941315bdd40---86086853788.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210702_023746_4778.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160d375e01557e---korajitodub.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd537ba96d---18737536650.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/f1d1427ffa02be6b95d27111a4ecba9d/82554355719.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/jq2de4cpoa7cl8fs7cnnjon9b9/62927022183.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/mekavosiziluduba.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/1123da655b5d857c39076845ad1d08e8/gapebepegonevusixu.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/55438139502.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/16616955732.pdfIn PDF document text
    • http://apvn.info/userfiles/file/2111776816.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/92015755468.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/og8oe6kld6mmtcti518pjdre0q/roteve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=mine+imator+community+build+free+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2E 10900 bytes
SHA-256: e4f77d401a16fc5b0ce6a7bf05bb03f455c46026770b6551fdefbe32e4764fd8
font_02_sfnt_off00012472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12472 17192 bytes
SHA-256: 4298b829e8e2550c43bd3e8aff19ff3e60b56ed2ac6171441dbbf25b1fc7b139

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