Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93a19fbac73323e…

MALICIOUS

PDF

84.7 KB Created: 2021-09-21 22:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4e2c9440e843f08901e8ea2a75d78d8b SHA-1: 16b5ad6a6cf610edb1598716d668ecd2bf8df461 SHA-256: b93a19fbac73323e7db68dd5cb21d31eacc76414ab772db42e8b69eafd9e9224
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics suggest this PDF is likely a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://archism.ru/uplcv?utm_term=truecaller+latest+version+2021 PDF link annotation
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144cfe998a18---27411982255.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/28804316397.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/2cb20f4943d0b72dfa822f2971f1ffbb/maweworozikafakevuba.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/5433793410.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/84183738308.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/49309338424.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/sedaxinonepadakewasi.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/28473663388.pdfIn PDF document text
    • http://status.cz/UserFiles/File/widisiketanuwem.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/dafubo.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/46791433986.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae9815e124---55724744467.pdfIn PDF document text
    • https://cncunse.com/d/files/xolabizi.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/81192769496.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/xixezorinopipemur.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/95730133655.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/89840337209.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/najosamejexikigaboraju.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/52312583185.pdfIn PDF document text
    • https://peterdegendt.be/file/lukejaziloral.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/64705975946.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/komapukodizafaj.pdfIn PDF document text
    • http://watch62.ru/files/files/zituwofilugerupejuvik.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/84203681441.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/39470343891.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/dogor.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_off0000e708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 17392 bytes
SHA-256: 8779deab9da75a4ed35d8dfcbc8637234d1570ad6b2a0628ea817b9033301848
font_01_sfnt_off0001142d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142D 10648 bytes
SHA-256: f346cce7ff1cf7df78656a40db2865ed070f54f55f49df73321eb9d26e316f69
font_02_sfnt_off00012ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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