Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7a07580e19d0a1…

MALICIOUS

PDF

79.8 KB Created: 2021-10-11 00:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c5c765a90a9e7d35bc037f1a33de21b6 SHA-1: 49ce4a614d6105052af26dd38f152ded4f8cabaf SHA-256: 6a7a07580e19d0a13598b40f1dba0b2fc0c9657dd6cdc73809c11d804770487c
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV heuristics strongly indicate this PDF is malicious, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://highfieldhousehotel.net/nbloom/fckuploads/file/wiviloxibadenaxuserave.pdf In PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/supumogofu.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/68599485461.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/talovimade.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/48427994875.pdfIn PDF document text
    • http://submission.jpvm.kr/pds/userfiles/files/47591253220.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134d60bab9de---vipikizarasufalanaru.pdfIn PDF document text
    • http://bdsductri.com/upload/files/67087067151.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/gedupakazotojuda.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb4731afd1---tikojonog.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/fawibumobusavoranizif.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/b1c7694b8ac0a48ce78fea09e1f265a5/lobaxori.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/95821051808.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/soxom.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/wijomefe.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210928045652.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/wogen.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/2904790183.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/tonobipudexedi.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/fuminetifudoxutu.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/7dvukroh6sbt47bopir2t8pdj0/74323205721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=good+antidepressants+for+anxietyPDF 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_off0000d535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD535 17156 bytes
SHA-256: 813e6442e863ad55c6d161453ede923c8acd0291acf7fbb812fa888fef9ed3a8
font_01_sfnt_off000100b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B1 10700 bytes
SHA-256: e9244b975da3d54b2a31a8396d02a7c8c552ae43fdf2aaa6c2d362f86ba9860a
font_02_sfnt_off00011970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11970 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1