Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e6f8e502b9e298…

MALICIOUS

PDF

74.8 KB Created: 2021-09-01 17:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae02cd661b0e50e2123fbbc31bf5ccc5 SHA-1: 374908d033ffc2cae60a4a11859e0cf539507902 SHA-256: 20e6f8e502b9e298d1aaedfb1213c8888d49ad15555d5671fe58c48f3d004bda
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. Heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's used to redirect users to malicious sites. The presence of multiple unknown URLs further supports this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://rcot.by/pics/files/75431616683.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef554bdf59---parelafilegexexamuvugax.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/3ohl1vtnh9e7tviai7j0hgc0t5/70497107772.pdf
    • http://tvcsoltau.de/userfiles/file/xunisukinipaz.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099cc8a95712---15902984205.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/8474dbbfe8990c3c567c9421ae369bee/melibudap.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e32952bb1---fimugimorujugoremokika.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703fa3c8e44---24544832972.pdf
    • http://dichvutheapec.com/upload/FCK/file/jusezomite.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/0094f9e69eaeb83b5c7e9b1b005546d6/vixokinajipalonomatime.pdf
    • http://suapaiatuipelehakefamily.com/clients/80707/File/96161390936.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/2665d2f368ba1b244b2cf2d595722103/lurasosoro.pdf
    • https://huaienclinic.com/uploadpic/files/vapojurunupitefefameji.pdf
    • https://oykufestivali.com/ckfinder/userfiles/files/47137786800.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f20c4adc5---41542058189.pdf
    • http://winfielddeli.com/ckfinder/userfiles/files/39674158113.pdf
    • http://isagenixmakessense.com/ckfinder/userfiles/files/rotozafetixuwufagizewudu.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c82039742---tizixitu.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/cb402b4f10b7c85dd1d378b7d734097e/38141876788.pdf
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/67259263226.pdf
    • http://michelschuurmans.nl/images/uploads/file/bijaxaxudakolosewewewakoz.pdf
    • https://12shio2.com/contents/files/66929644911.pdf
    • https://underworldgear.com/upload/users/files/tuzoxetezopakumipemiba.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/a63948d70fefdb50d0435d0d2f84fc41/wupinifibogonurunu.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/6kqriliqhul6psuumsdfacvp0f/vivajasedekikezupanezeze.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=where+are+you+all+from+in+spanish
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c071.bin
418ae39d93b0e12df67aef41878fcf2818fa22259a4bb519e34a8c9a715e4a3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC071 17448 bytes
font_01_sfnt_off0000ed55.bin
b4e9a49c90caa2ba8b28d6969bd60746b21e04cd849af37a66fe6e19b3b3a0ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 10732 bytes
font_02_sfnt_off000105ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105CE 16792 bytes