Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d519ffa30d0f1e…

MALICIOUS

PDF

71.1 KB Created: 2021-09-27 10:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: afbdf5793d5f488dcd4b83ca765804ad SHA-1: 3e3fd4f9e68da0033f83395b92e958987029b8ff SHA-256: 84d519ffa30d0f1e16049028513007d1ef7d84f98e02bfccf66cafd02c8b6c1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://crewmak.ru/uplcv?utm_term=portal+2+all+console+commands PDF link annotation
    • https://ewt.cz/res/file/6480370329.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/sogituzo.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/risuperoguzab.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/51579896330.pdfIn PDF document text
    • https://phukienbep.net/media/files/12288527812.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/50817753666.pdfIn PDF document text
    • https://ptogel1.com/contents/files/20038795223.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26276651811.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/56626287192.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/tapofo.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/42aff27a53464d9f91bad081b6211bf1/lofavobexowo.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4e5b8c38e9df8e2bde84f967ac3d5c66/timajefumesa.pdfIn PDF document text
    • http://belst.by/upload/file/vebigizadagonolojosuve.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210925113837.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109161025422356.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/82017562914.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/gojogi.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/rukopamafivonuwijoso.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/xofapanaka.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/fakogotij.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/mojajarafukuruxiroru.pdfIn PDF document text
    • https://penal-garazh.ru/files/36090519387.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbe9a43083---taxoreliludeseru.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/xupebat.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_off0000b37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37F 10560 bytes
SHA-256: d1e5b383ab7d4e91e207c779469940bc40499a1e00c3a6ad1c46ecc1a4406ab1
font_01_sfnt_off0000cbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAC 17116 bytes
SHA-256: 14cda9a2319bd843ef8cc18de34666cce583c6770ecb36f398c19722e4a83ec7
font_02_sfnt_off0000f6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1