Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea32d6fa293d497d…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 23:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f71cb6099d7f772dcb9d8fc4cde4f79 SHA-1: af1f776edbb15c51c0e91e98f61bccafaa4dc181 SHA-256: ea32d6fa293d497d0d24311d675195fe9b8e667a1927c00be8f00d41cc3880c1
156 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 high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. The presence of these links and the overall structure points towards a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://catamma.ru/uplcv?utm_term=full+sat+practice+test+pdf PDF link annotation
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc9425820a---nokeliga.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/mowifixodikoset.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/lesasuroj.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/kafugexokudebalobe.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/48167861524.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/20292364955.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/rupopibure.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614820134d324---90864467090.pdfIn PDF document text
    • https://iwistw.com/upload/files/fasexapaminonu.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/27943860121.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/gademod.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/mizaverelagagisadugabi.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210906164739.pdfIn PDF document text
    • http://anpo.vn/upload/files/jibijiwidowusovot.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/lagadovisedul.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/889fec8f8aed2cc0133205e6b4222962/fuzaxutegegenon.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/521dd5b5a71913123c0b3177d7f445f3/rofaxojaxawibabo.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143d06267705---97330922526.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/foxiwajaxinojokalilazeful.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffb72f05bd---66417110020.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce3bee40c8---tulezubewadiralesik.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/raretisejibemi.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/79283047484.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/gamugugunevogoruka.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/88096799567.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/42970665567.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_off0000b353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB353 10464 bytes
SHA-256: fdba982deb22dcee28551ee49147c043127d9fc38f545b3c54787282091a7a1e
font_01_sfnt_off0000cb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE347 15376 bytes
SHA-256: f5fb97a21e96ef825d68faaa27295122ed51d77232a60e62cacd19b0f745dac0

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