Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d11a9f3dea7fb3…

MALICIOUS

PDF

76.5 KB Created: 2021-08-08 10:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f23b1b640294adaffc89ba563719f8a4 SHA-1: 9fb6d17fc27bf0a1649cfc1bdaaf58ba5f22c19d SHA-256: 16d11a9f3dea7fb3c737dbf266e7ead37cf477f8bc85ee45343532d58b19e9fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://pixomot.ru/uplcv?utm_term=rikki+tikki+tavi+comprehension+questions+and+answers PDF link annotation
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/f3af2409290ac3766448c99297df4602/58543052098.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/50173353400.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/77583488259.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e003874d6edf9d00a2f754a6034ccff9/memox.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/pazenibusi.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/kofoz.pdfIn PDF document text
    • http://dso-fuzine.si/docs/rebowibipukuwetajenuxi.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81c01df34---79244153368.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/1207427478.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/b4b942c8aa715613945b4a086cc153aa/sidizofifisuxodasen.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/n81rv251kolguhrjppabd1ddjo/vikiwilot.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/lepuwajadisisonuwejobodi.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a2f34d5a0---29783405359.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/80983716811.pdfIn PDF document text
    • https://teyadegitimvideo.com/calisma2/files/uploads/musanaxudo.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/b5cc583c889282f1b706d3ce5eecb274/xumulanabatolumo.pdfIn PDF document text
    • https://artbynela.com/uploads/file/67059527661.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/21074032635.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210618_070006.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/fatov.pdfIn PDF document text
    • https://le27.fr/docs/file/69631333724.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/56272496172.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/6vmp7odg366dhk520scbjl0kdn/sejowatatabo.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_off0000c615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC615 11268 bytes
SHA-256: 9953a902fd56091c7fed4233edf2bb1db970b981fe784e65cec5f68d385fc621
font_01_sfnt_off0000e03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84F 16672 bytes
SHA-256: 51132b066d55f48a8bdf5a1a7af0bb8aea79cdec336a032c914e4a16c87c1c60

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