Malicious PDF — malware analysis report

Static analysis result for SHA-256 73cd839e79e8a29a…

MALICIOUS

PDF

83.4 KB Created: 2021-09-03 03:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e6b64f709aec127a0a2f2c7e5409cf2f SHA-1: 4a593d4776e66931aea3cf6eeb4f18b76d96d323 SHA-256: 73cd839e79e8a29a0f75fefe11da493f2f14e07beae713fb37671402fa6ac135
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://ed-web.cz/userfilesfile/98816607104.pdf In PDF document text
    • http://agcslohian.com/userfiles/file/86524667334.pdfIn PDF document text
    • http://warehousetraining.ie/images/wabijibodibifurumezanovuj.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/44923663705.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lesemiwinexodezuzabib.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/lugefoseponuzepasi.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/rugowunogipukimajikew.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/21738743243.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07ed77d440---9977885432.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/vijikexubazubirekiva.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/kejoragesutijox.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/19894673088.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/70953662935.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d2bfa472c8c---vurizogavigasadegalagele.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/91165520996.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/64511423916.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/232d052c207606e167923307496abd50/51840895799.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/5e03f7b1b1a9f26c2adc0ffbb00c7e03/30791257240.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dee1b7ad7---17099875697.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/f18944f4d373e653a0dc58f2400f6247/likezef.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/getedexobupabavog.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3d3c53183---luladukomodejotevimugonag.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/a0e853a937af911dd289794389224d05/tagapetixiwusumir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=samsung+virus+doctor+air+purifier+manualPDF 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_off0000df42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF42 17868 bytes
SHA-256: 9e83bebc4d5b3b1e4b7a3890e57e8a127351e761911d271289ddcea41645239b
font_01_sfnt_off00010dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E7 11204 bytes
SHA-256: 4fe6157278157b1b4f51d341cc597131074a19e5b6d0220f96bef0736c944211

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