Malicious PDF — malware analysis report

Static analysis result for SHA-256 76874d9690cd99cb…

MALICIOUS

PDF

75.6 KB Created: 2021-07-30 10:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bc011b30b7d2eae588e1e0a9b8484620 SHA-1: 34361842aa2578281955ecccde7e8ce07de79dc9 SHA-256: 76874d9690cd99cb91872a5925e773e5663626decd2d09ca0d4ed2e636eb092f
164 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS upload storage, likely to download further malicious content. The presence of numerous unknown URLs associated with formcraft plugins further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a4fb60f0d---sipezotoxowodit.pdf In PDF document text
    • http://absolutelyneon.com/userfiles/file/23691440468.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48050b9a0---6696400737.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc6727580d---4823252457.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/86659976481.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/94131883502.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885dc880ed5---3821297487.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c563cfb9823---faregepepak.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/16735703126.pdfIn PDF document text
    • https://partnermind.cz/images/files/bodonosuk.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/naronuziwufabejazobi.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afe4fbbb004---pizowumipobeb.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/52271524608.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/45660998312.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/kigofefexakixa.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/16621401816.pdfIn PDF document text
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/lufajipinototofasopigu.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/71161425458.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f27905a888b17089cc0611b019df0909/30340948423.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a71be16600---93878144037.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae60a0ef82d---nokazujinixifibowujik.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/90017249801.pdfIn PDF document text
    • http://fitviewer.de/files/file/gibagi.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/nedeberomoxonezeginovox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=wings+of+fire+free+pdf+books+downloadPDF 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_off0000c3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DF 16060 bytes
SHA-256: 70fb73fa8d8baf683fa744699b2b443900aa5db14e34cc8f792cd3caf9cb8126
font_01_sfnt_off0000ed44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001055b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055B 10888 bytes
SHA-256: 3c7d9c2cf2f98950d5f6f6d061d23030558c003e69f7cbdeb588fe1767de13ac