Malicious PDF — malware analysis report

Static analysis result for SHA-256 40292cc5a225d2fb…

MALICIOUS

PDF

85.3 KB Created: 2021-09-16 21:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 09d29d85da220f6973f7ccf83299b8b4 SHA-1: 98f9a6613e065c95f39c31e1975f540625c2dc6f SHA-256: 40292cc5a225d2fbb75b3563ba10d531f5427fbe44855f8650f43d2ef10f036d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to manipulate search engine results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://prompol.com/media/file/57269982896.pdf In PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/watagosanaligav.pdfIn PDF document text
    • http://vinmexindia.com/uploads/58770507899.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/52764038405.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/35126504731.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/riworamesifavepejegexap.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/sipikilibeki.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/nimapareduviguvebuwebosad.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/69667641938.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161384efbb358d---wabirolutusuwudus.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/vogarefenudok.pdfIn PDF document text
    • https://estoniapools.com/contents/files/33408249917.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/kapatizilufuxuraxapaxom.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/99629385491.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/35798109727.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/53317228694.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/30645130790.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161349685dd671---20691169304.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/92969057628.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff85885b0b---sufenamodox.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/pipagugabijoxiwowomexurud.pdfIn PDF document text
    • http://vanhacollection.com/images/files/japitidikixedune.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/98016897286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=msx+android+emulatorPDF link annotation
    • 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_off0000e895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE895 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AC 10604 bytes
SHA-256: 959fa4f0df9b61f1563dba4f2e688fe0c098ecaac19a0bedc23d2a7a8b688d19
font_02_sfnt_off000118e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E3 18048 bytes
SHA-256: 371e4b161a9aad6b666dc15e9e7e77a472c2f8c78784bded5d8635641c4e9fee

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