Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e151f90aaac4a5a…

MALICIOUS

PDF

77.5 KB Created: 2021-09-10 13:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c0c54e0896b3500e6044031560f6b96 SHA-1: f00107d7670158c52eaf6c82120d6c66aaf6a8b1 SHA-256: 1e151f90aaac4a5ac144e5ddc0bbecfb14de873305ee0558818016729f760f6e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains numerous links to compromised websites and a visual download button, suggesting an attempt to trick users into downloading further malicious content. The presence of embedded URLs and link farms pointing to potentially compromised CMS uploads indicates a coordinated effort to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://oniceh.ru/uplcv?utm_term=download+fastboot+drivers+for+windows+10 PDF link annotation
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/87e97ac0e2bbbb50df7cf0dea17067b7/ruwepipude.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/subiwopudisulanepad.pdfIn PDF document text
    • http://vucert.vn/uploads/files/70156059464.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/84720356551.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/rabegoripimibelimig.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/90802918556.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/88951137726.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/rekalijuligoxavab.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135114911c75---giwufoduxiwados.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132fd53a445c---jixetexewafamoxuvovabego.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///35827493342.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134115c07a74---tawakevekifuxasobomiduw.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0902/99db3d7d51aaf8469a487a9d20e15afe.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/67763645193.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/57585766454.pdfIn PDF document text
    • http://stagticket.com/fck_upload/file/73967329068.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/57526116774.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cb0f130ba---zazawokepomebenibevini.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/dosopujonu.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/8106127458.pdfIn PDF document text
    • http://asqcert.net/files/files/zajuxonaxodafovem.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_off0000c8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E1 10812 bytes
SHA-256: 52bb9af947a3a61a281f6b34ee3b025b7b85cdd136f84f0c7bca0831a88a6ff8
font_01_sfnt_off0000e203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE203 17752 bytes
SHA-256: f00523d293a6c94388bcee6c4d36cd4386e3d161a88c4aee917c57430352dd92
font_02_sfnt_off00011036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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