Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c85c7953cecbdc…

MALICIOUS

PDF

89.1 KB Created: 2021-09-21 01:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7f41778dbe226e1c9be33b4d9d7e9604 SHA-1: b8d1ef1537ca4dc70cc010710036ab63c6bdc7d9 SHA-256: f7c85c7953cecbdc8b39d13c4b38edb6311cf06f51714cc6fbf37570ead5ac6e
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and malware distribution lure. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document prompts the user to install a browser extension or update, a common social engineering tactic. Numerous URLs are present, many pointing to potentially compromised websites or disposable hosting, suggesting an attempt to host malicious payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://huntic.ru/uplcv?utm_term=chrome+ghostery+android PDF link annotation
    • http://louisamerino.com/userfiles/file/81273867616.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/85808599814.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/murerurupedezes.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/rugeso.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-1/20210901163837872675.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/85814527513.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/zimisapugup.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/98281189394.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161409259842a1---25496140892.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/d22be5fc35019a30614ea3c0737c6ca4/13508481182.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/mosevubukuwibot.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/sijuwopobuxevemij.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/20597547878.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/18107652195.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/geloboxatilumuwefemotufuv.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/sumane.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109082006067146.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/16140248113.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613c669d8249f---80120223867.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/83174998252.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/46052075493.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/54737758931.pdfIn PDF document text
    • http://boldogelet.hu/media/nibosutukapavibuwulen.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/10197663671.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/vitenuvusuverilebepe.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_off0000f7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CF 10796 bytes
SHA-256: e4547dfd96c96c4bfcc6d229af38f0ec985824f4472be206598d8b4f16fa5f5f
font_01_sfnt_off00011060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11060 17960 bytes
SHA-256: 8973525992de499ee8c926aa670fe3e5b2c9238e484d4ed2417c89ddd176e867
font_02_sfnt_off00013ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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