Malicious PDF — malware analysis report

Static analysis result for SHA-256 e865d871460e33c2…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 06:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5338a75f564529ee0b9d07acc7997b36 SHA-1: c55061e606aed45bdbb3c796f52ec23877bd6f21 SHA-256: e865d871460e33c2588b997f1ff524c7bf28ff32563820bd648868cc084237ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a common tactic of using documents to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://chcial.ru/uplcv?utm_term=print+secured+pdf+document PDF link annotation
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/27578905060.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/15684583405.pdfIn PDF document text
    • https://miet.hu/kepek/35122503836.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5f599721f---bugofumoz.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/17637249881.pdfIn PDF document text
    • https://securitydm.com/slicice/file/89496611276.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/gubazobibowoxanifofuz.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/kefomeketosaxumaz.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/muvupawigaripuxu.pdfIn PDF document text
    • https://udruga-invalida.hr/files/46750154741.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/farenuse.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/79331664324.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b857259fa65---zizetiz.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/rawuvapesemow.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/9984c8527b6cce6ca0b046069a404e62/74140937674.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/zazoxizifat.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/zowiz.pdfIn PDF document text
    • https://marosme.ro/hirek/file/90384911258.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/54163309443.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee7441bcac---68148473956.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098252cd0403---mebasuxogefuraz.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/67059162762.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/21518729632.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_off0000da9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 10676 bytes
SHA-256: f100ae3e628b9e264cba7947795bd85e60816d128a215658a26e3b45f16205a1
font_02_sfnt_off00010b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B23 18020 bytes
SHA-256: e99ba7fb416ba5c198043794685f1a12808add3431363758f5cca854c161044e

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