Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb3c8a51a9427fc…

MALICIOUS

PDF

89.8 KB Created: 2021-07-29 21:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1490cdee62a3e8c160b6d2e134451654 SHA-1: c337803cae2f608d87100af00afaca01e456135b SHA-256: 8eb3c8a51a9427fcfe8eee8fcb3a4ba3e4c972cc25e5161f4d41bdc4882a8ef5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://aarogyamedico.com/userfiles/file/mafusupedavozaxidavevuzaz.pdf In PDF document text
    • http://hanboo.cn/Uploads/file/2021051504573970554.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd97998fd2---kimozo.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f55a8b1e33---felarumekuxiwute.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/ridigirixikumabune.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/2361022218.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/9648747077.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/47294119797.pdfIn PDF document text
    • http://hyderabadibiryanicorner.com/admin/images/file/mepegelavolilofekoj.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/bba113d396f21e8979feb683a6ef1123/jipidebev.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/97812164926.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/890ea0f475082e8594881c454907cdd3/filidaf.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/c929d80a0a2d66c3c133e169767e0f22/judanigosewur.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6067ae4bcb---deminafav.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/lebof.pdfIn PDF document text
    • http://muszempilla.com/files/file/newewerelulemibodukag.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99204302189.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ag6i591e2v8eb7seim2kvj0p3/35119623829.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/zatofibene.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/27714339348.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160780ad8bf1b6---ponilebokarabunij.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607425b30be00---34280921108.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/38281bed38c105946aecb723b0190ab0/99350569505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=elements+of+programming+interviews+in+python+the+insider%27s+guide+byte+of+python+by+swaroopPDF 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_off0000f806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11018 17712 bytes
SHA-256: e3e041314a80e008d450a8d0ab84c00dec4354bfd79f164c747be4f0fdb9809e
font_02_sfnt_off00013e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E72 11468 bytes
SHA-256: 795a5ee781bdbdc2db2447d66588540f82ed92598ba6afd8cac8ebafb4a1e74a

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