Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a7d65dfb3f366e…

MALICIOUS

PDF

88.0 KB Created: 2021-07-04 21:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 438ee5025f576da3480e19453b0d28c3 SHA-1: ca37fc707fc0b91510b55ebe5a6617075c5aa447 SHA-256: 73a7d65dfb3f366eb4daa47fb285e02f58edff62eb8aa8b75712b6f9ffc8185e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or engaging in phishing activities. The presence of multiple distinct hosts and the use of disposable hosting indicate a coordinated effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8889dd2afc---71122907337.pdf In PDF document text
    • https://tramhuonghanoi.vn/upload/files/78267240313.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/9fc7de7d77e5f825dd003e3e2aa5f097/48383717675.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/62632c10b80976a6ebb770533da4501d/wosawogexeg.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/70651855438.pdfIn PDF document text
    • https://laser123.com/geektic/files/93187659468.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/49396592092.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/04gdobao5g74cgncvhuc7qhmt2/suzuzose.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/pojuxunalijekopef.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/mituwakuxawivud.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085d5b87e3ae---rosiwezufamumiduf.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/71308973768.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa6050dc6---vegenipisukaz.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607952da45332---25564975243.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/gezujewemeseru.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/6543463661.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/e1215e2c8ee6a59c8a9050704b8aa403/vazufirisosebafomu.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/47184113700.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607535ea0dbc9---nonepekidovijorese.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079eec240b69---finogabizo.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/25271578055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=questions+on+triangles+for+class+5PDF 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_off0000f40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 10804 bytes
SHA-256: 345a963b72c12c25b3e58678fd5e54a8c30a05752761874878c9ff74bca62b95
font_01_sfnt_off00010d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3F 17644 bytes
SHA-256: b1bcc5ecd9666cd236974ebc2853f0ae099194b47af7617f49ea91c94b0fae05
font_02_sfnt_off00013b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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