Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8b2693d450a7e2…

MALICIOUS

PDF

84.3 KB Created: 2021-08-26 10:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0585994a4a1b2ee6b1a73118c43f43c9 SHA-1: b71fda391e2bc65efbfd2b5aed5af23bf4968a4b SHA-256: fa8b2693d450a7e206febe1756120c3bd59b66dbcbbb644c3e4cd6a1df6744cd
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised WordPress installations or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites. The embedded URLs and the nature of the link farm suggest a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://villa-carlshorst.de/sites/default/files/file/87177507477.pdf In PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160986894672fd---85652213290.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/fonajobozuvusenutaliza.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/28314231541.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/4c3eb89a8a5a2f75a4f487c4f4ce39ec/73134482184.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16208609811769658217.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/sokafe.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/bd0bf48e439cbd456d549c82e88beee9/sonala.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/gasuborozodowolokofe.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609093d9627fb---62776034020.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f22ddb515ee---91350314252.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160998878ef5ea---51849618295.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/21607897304.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094390271818---nivagobemeradimodu.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/62512310308.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/53731715227.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/62924235760.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/62695535757.pdfIn PDF document text
    • http://kotolantopeni.cz/file/99871892054.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/17281924271.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/sipukadenukinevelos.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/61149976902.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/7b9812cec8db0943525beb172c097c9f/56575598518.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/xowawolobonisodor.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/1a0218769bc4784c09882736f796c315/53028937035.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210525211601.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/at8a724nupd488bfq6svvu59t8/74294969726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=poetry+on+beauty+of+girlPDF 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_off0000e6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 17008 bytes
SHA-256: 45ac554100692dda97af89d64846a0b514af12350dbb06d78b0c210785d91c6b
font_01_sfnt_off0001126f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126F 10576 bytes
SHA-256: 035e1cb3c4446900d8815c739216cabc429445ed93cb1e838c21648741dfdb85
font_02_sfnt_off00012abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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