Malicious PDF — malware analysis report

Static analysis result for SHA-256 241cb767ebd07bdf…

MALICIOUS

PDF

76.0 KB Created: 2021-09-07 17:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: afa1162def623d1e914fdd694bce1bd1 SHA-1: 272087098667eb889a8d591659958af1dcbc4326 SHA-256: 241cb767ebd07bdf8b7551096556b53f4f662f31bb85c41aa48ebc3ac6496d99
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. Heuristics indicate the presence of external URIs and link farms pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://nomylo.ru/uplcv?utm_term=series+3+exam+pdf PDF link annotation
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a360648fc3---jitabogikeletirixesom.pdfIn PDF document text
    • http://cjatkinson.com/userimages/gewal.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d002d84b51---3385238565.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/sewegirude.pdfIn PDF document text
    • https://menu2uplus.com/images/file/lenakosalexomulipatujip.pdfIn PDF document text
    • https://slide-bearing.com/d/files/nevunamefalasesixomatomo.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/madazewe.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/zetejunuwabokawizana.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuroresuzitojiveluwono.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/244c8a7a8870a22c939ede56565c4fc8/kulubureselupeposaselop.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/pb5f7dq6jf15dj1blhb8994pnr/daxipakunakavugenuwopimed.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b6e78bcd---10803972651.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/misibibo.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/27727239481.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160f032f6a97bf---gutezejedafas.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/29360892194.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/18230272329.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4294e5e37---tepenenupigerib.pdfIn PDF document text
    • http://truthtube.com/UserFiles/file/tusivowinorilifofizomuzi.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/12674dd50eef35ad3d7c0c2789856abd/68929137887.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/80802qaq0o89fhdt7dn5i7qaf0/76563519588.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/0fafda55462b74b3c7dbda5be813310f/48636599441.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/552570a65e9def498e35c8487594074a/85336822988.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_off0000c4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BB 17736 bytes
SHA-256: 30cab7a56f4d5828d5f604031d2a64eecdaa844e82415256912e1bfcd8342177
font_01_sfnt_off0000f2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC1 10640 bytes
SHA-256: 22e0fab2411ef7bbfec7bd3dafbdd315e1a71ba39df08255f2f88f9530cd1266

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