Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa090a5a407ef18…

MALICIOUS

PDF

88.8 KB Created: 2021-09-23 02:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b19dbf140ec6ae4e1569b239291fce50 SHA-1: eccc149df4401c6753dc89141a2acfca9c93fed4 SHA-256: 3aa090a5a407ef18e611061ba0d9cc2922012bbd4d38a36fc027c1c971abab7e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple compromised or disposable hosting sites, suggesting an attempt to redirect users to phishing or malware distribution pages. The presence of PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cyuansheng.com/userfiles/file/48899919038.pdf In PDF document text
    • https://fptica.ru/images/file/vawafetanofasirodawukux.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc5f6d84d4---ruxodof.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210916213505.pdfIn PDF document text
    • https://robertbah.si/files/file/jakogumafe.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/30448099130.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381ca8e7d96---39004532210.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/nujikovexiro.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/48887014480.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/ponot.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/85996615111.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/28864861268.pdfIn PDF document text
    • http://i-dron.cz/data/file/soregu.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210914054259.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/lodegijadelasavaradeg.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/sewoxi.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/28607216774.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/ganifazatenawifu.pdfIn PDF document text
    • http://alkanboya.com/files/file///minaluxitemi.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/mokfeh0v4gs16jqp5npm47r83e/87274063422.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/371dc6201e331d8bf0773094e73d8466/buvelemajal.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/tisedutegifekevawexuvufom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+watch+war+movie+onlinePDF 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_off0000f882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11099 10472 bytes
SHA-256: 34153859b990179ed6a1b4e8c18575f24c629de0c431a160420969bd0e952ff2
font_02_sfnt_off0001282e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282E 17596 bytes
SHA-256: aec624371cd248bad30e19820ac8e58a80a64f535e0529d91e3e8763671a90da

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