Malicious PDF — malware analysis report

Static analysis result for SHA-256 d473a7358ab098ce…

MALICIOUS

PDF

69.3 KB Created: 2021-10-18 13:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a886dd0d8753bd7032541ff8323c2ee8 SHA-1: 0be0fc7fa47ff32cdb784dfcb8059b3bb9c80fd2 SHA-256: d473a7358ab098ce3d0236d8849b8fe020e7e628216d1bfcfbc5a2a775f6b156
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, some hosted on compromised CMS uploads and disposable domains, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6736

Heuristics 5

  • 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
  • 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://czytamzezrozumieniem.pl/userfiles/file/53801642985.pdf In PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/819a4c74fab3eaed4170950dd7f981d4/72394980157.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/takutirojef.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/gefavofala.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/tudozolelawuvirifod.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161604f3cb49cc---59389617237.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/rigokujofoxikunatekoni.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/37380368133.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/refowifabitu.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/lesanomalikanusutakosumo.pdfIn PDF document text
    • http://signfabapp.com/ckfinder/userfiles/files/46621896629.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/mutebotivulitefovudonavin.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/40023838183.pdfIn PDF document text
    • https://sambelteri.com/contents/files/bekinidasutigikebapifup.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/kinixebibaxoge.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616491f864bdb---39414067690.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/61826196208.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a747c2dbf---tenuwazosexabufuraroririd.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///bibunirari.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/diraja.pdfIn PDF document text
    • https://slavicchurchmississauga.com/fck_upload/file/dozikiweb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/23D8k0Ec_6w/uplcv?utm_term=fallout+3+unofficial+patchPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7C 10424 bytes
SHA-256: f8b17fcd464033eb72c1325c8155c8eb1bf8945bf651a3e6bec53c44d32c125b

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