Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9e6ff66016f90a…

MALICIOUS

PDF

94.8 KB Created: 2021-06-26 14:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93c1955def15fce799da53ed85b54c70 SHA-1: 73bcaed0155d0de7a6c96c011c9cf6b2eee166ab SHA-256: 4b9e6ff66016f90aebb910d6b1c38cd85f02fe07f6e773c5ad4be2d0a5060841
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/889fb2ac875a124ab476be2c25a29200/lugowe.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf7ba81568---fopidiserup.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8914dbb32---fimekuxatof.pdf
    • http://liccuza.ro/stiri_files/file/98943309964.pdf
    • https://imagebeaute.fr/userfiles/file/11075372360.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8228722de---tuzawafuzatabewimojigun.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c89b580b33761f4ae2d5a1fc473c94a8/61127738741.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf96582b27---gixafaxid.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25fa20f20---13319434084.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a97b9df67d---1138884736.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cdf68ad2d---42641433294.pdf
    • http://whatdwellswithin.com/file/7118091062.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/5d395c1567f5e3b384884c97060551eb/85071847811.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd02ed2326---63099547747.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/398b552e92d77ef0edd695b1b69d4742/wurilezigaf.pdf
    • http://meta-min.com/files/manuneravemukenidipawot.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/fuzirurikozujimeg.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/d4878766cb1efdcd65760313b624cb4a/xozep.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c890476f43d---83849332932.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/fq5975env3hvu55pheqhg84iod/kafogel.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ab2b5fe0a---kofuzowefafot.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160871c9ca3f76---27519287687.pdf
    • http://autosklo.sk/pictures/file/mepus.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/elpbp6m2i6loir4138htiam3m3/benumopibifisiberaki.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=fatale+with+hilary+swank
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7f9.bin
2bb2c9f742fab340d8bfc7866c700c964840c52abe6d2baa107c42dfff056acf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F9 16340 bytes
font_01_sfnt_off00010df7.bin
cb4d099c612f11d0d0306f6acef60b1394f0168da17e916dd5a6e671d41af843		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF7 10352 bytes
font_02_sfnt_off00012558.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12558 16792 bytes
font_03_sfnt_off00013d6a.bin
2833ece8b582383d40ea81d77cc63948dfd40c99b1773dc9c9b7fa38a9c480a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6A 18388 bytes

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