Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab63f9de41139ea4…

MALICIOUS

PDF

79.1 KB Created: 2021-09-14 01:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ab739dfbfeced0cc9cf1a084d038401 SHA-1: 3fcdfef6c79cd2a323d6385244038ad23867374c SHA-256: ab63f9de41139ea425d9f94145d1142f7e9f576850e1fbbcc17cbc2f6447e295
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to other PDF files hosted on compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://goldenbaycruisesagent.com/userfiles/file/99547237799.pdf In PDF document text
    • http://huzatfokozo.hu/editor_up/vufikovewub.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/386444168.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/16778112652.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/jatate.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/191f86fcf2da606f82690d61e4c93180/26955389688.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/24c7f0a11ac92bc8d5e4f6a5ad105025/88813397977.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/976af06df74c9fce3f5b5e1c772af6c9/91615618008.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a415c7e789---rolinemokin.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/86849267710.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/toxavejeg.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/suximiwel.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/lodunewabokeg.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/gepikosam.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fca76340b4---motoleli.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/1450480920.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f79556e404---gigoxos.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ac7b98755b3f4053b1bee79ea82854f4/95368474615.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/saralaju.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/zomilugen.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/58794623398.pdfIn PDF document text
    • http://seamacros.com/upload/file/jilapitezi.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210912/file/16314526178806.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/35158414540.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/37282816808.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/jowajijisivifiwobarefe.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/zepuxumafegezeruf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=shadow+fight+arena+download+play+storePDF 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_off0000d29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29E 16412 bytes
SHA-256: f96326213de072fa08fc715b9958ad96333cff54ee87c6fe997594dfc5463ad2
font_01_sfnt_off0000fcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAE 11052 bytes
SHA-256: 57077cdfb0568753a1aa5184d274b7c38fc7a78f0f507fc94bd34c180daaf7f5
font_02_sfnt_off0001163a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1