Malicious PDF — malware analysis report

Static analysis result for SHA-256 68672807882350f7…

MALICIOUS

PDF

77.1 KB Created: 2021-09-17 09:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a7df068be08ebbff7d5865ced31212d8 SHA-1: 094bdc04b3844e3edc8e36e7e028b2a43c90f409 SHA-256: 68672807882350f7a7f27354f05479c804a457d7fe2491ece4d7cedd01d23094
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and trojan delivery mechanism. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's intent to trick users into installing malicious software by impersonating a necessary update or extension. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's part of a larger phishing campaign, likely leading to further compromise.

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://megamento.com/_UploadFile/Images/file/75248859061.pdf In PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/95857627133.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/ribazara.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/wadej.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/18448279958.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/gelusofasujijute.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/24470223743.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/26564984032.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/63298087709.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370454b0adb---7918380563.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/renepeloxovapamud.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/85285050237.pdfIn PDF document text
    • http://savemaxint.com/files/file/4895842840.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613632441f312---rasagajar.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/28103e36a17792f5695596c1ad4fa669/40854080069.pdfIn PDF document text
    • http://moristas.com/userfiles/files/zitumilaperupale.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/damenejisev.pdfIn PDF document text
    • http://elitacasa.it/images/file/83698635247.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/fb8d6510f3eaa55dd6c5b6f3426e54e6/27847477561.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/wivugezebedazudolimug.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/65094893479.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/xalegumitejuwapidor.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/98584129253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=free+for+honor+codes+ps4+2020PDF 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_off0000c8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EF 17676 bytes
SHA-256: 9a52b47a1ae0628500f883a56c281a6fe916ed71750b8c1a7d47bf73cda11ec7
font_02_sfnt_off00010ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF5 10616 bytes
SHA-256: ccbc64992504f75f952d6513e5271142e5571810a154e85521cdb38aff9592de

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