Malicious PDF — malware analysis report

Static analysis result for SHA-256 98919015566f09ad…

MALICIOUS

PDF

78.2 KB Created: 2021-09-19 17:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3654eae4287dc61e4140e29526b41858 SHA-1: d07b70d4517844ffd912de78a5c9eb22c6626fd7 SHA-256: 98919015566f09ad97ca05281fca214a15276a6867b147e02b0cb67df070e5a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of a URL with a 'utm_term' parameter suggests an attempt to track user engagement with lures like 'minecraft for mobile apk'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=minecraft+for+mobile+apk PDF link annotation
    • http://networkinglikepro.com/ckfinder/userfiles/files/11745765256.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/3618080253.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71193787614.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/kokojopagipu.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/bfee587e57849405b466b6b36d9d569e/zilop.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/bebevovepidu.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109051146307354.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/fevunekabaxog.pdfIn PDF document text
    • http://tzsunup.com/upload/tuwotijawuvedowego.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c50fb2795bbe4a799084e5450afe07b5/72007906782.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/futegazevuxikagamiruso.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/99c0e0fd19dc29659fc570c16f1eedf6.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/mudukarezofelu.pdfIn PDF document text
    • http://citra.cl/userfiles/file/96824751439.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/manugudazuwutug.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/xozixezewel.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/32355978659.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/90083925034.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/34079043750.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091403322980554.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/50009741012.pdfIn PDF document text
    • http://rjt1.org/upload/files/44097874523.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/forogaxezegepevumigexurex.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161467c75921ae---16868146222.pdfIn PDF document text
    • 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_off0000cda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA9 10696 bytes
SHA-256: bc482487f0bf7514d0a3b40a653cfa095982b09792784581db436bcf0d5bdca8
font_01_sfnt_off0000e5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 17380 bytes
SHA-256: c07d8a16484052ee7e19f66c4e1e84e9985990132b151c249dd06f092cb9936d

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