Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f5cd4d166a5d676…

MALICIOUS

PDF

92.6 KB Created: 2021-06-28 01:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 501f0254c3f5b07acaf3a62625f362bf SHA-1: d4a1958679cb0b7e2c774aefbc4996ba6a63029e SHA-256: 2f5cd4d166a5d676fe93f0eb01b2fb714162230c08e7d80916959efe74f69dd6
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd73fe689f---kanategat.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/7dd9dfc63ee26a28a24076f6b728b72d/jenenutonilagozomoruxa.pdf
    • https://nepalimodelagency.com/userfiles/file/10666808358.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/1254ea360fa3a759cb6211718df61843/rumugonuvunubodemidab.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160945ba8499f5---wekibulinakovowunova.pdf
    • https://saam.vn/images/content/file/tasitenelodenop.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/99ee2dd6fc39f932dfe074f79a098c08/wovugemozofukudof.pdf
    • http://coming-c.com/userfiles/file/13384349789.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/n008qjuhls0pl0q1i0r6a5obnv/59248374735.pdf
    • http://axiomestates.com/userfiles/file/fumubaleje.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/cr4omom9ucchclla74methovis/60985839943.pdf
    • http://utuin.net/files/fckeditor/file/wozimajukazuwabasipitode.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/f59847726724115bba470078940ee9e3/46282034579.pdf
    • https://editions-tlp.fr/ckfinder/userfiles/files/jovurip.pdf
    • http://lycee-elm.org/userfiles/file/powakolevinexoxu.pdf
    • http://magicdiscoradio.hu/userfiles/file/kowugujipetixo.pdf
    • http://hacoauto.vn/upload/files/88084336160.pdf
    • http://podlahypilat.cz/admin/file/84971499999.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/e1d1f1cdcf2dd7dff86fb249c797be42/vakipibinavibafufevenuvor.pdf
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/39498462348.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608625786f09a---82009731684.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/e51c05b5e51638085d8b4a73fc5e7224/vekoropup.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=martin+luther+theology+pdf
    • 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_off0001087c.bin
d98873aae50bbee7b029cd96547d1b0f4a97c1ed63c49d89bb8ce448cedabc46
pdf-font-stream PDF embedded font (sfnt) at offset 0x1087C 17016 bytes
font_01_sfnt_off00013494.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13494 16792 bytes
font_02_sfnt_off00014cab.bin
eac6b3e875d27a6b464c01e7d2c767efdc9835989c93b85f282eab122d7b7ec6
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CAB 10816 bytes