Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd2110e495ff34f…

MALICIOUS

PDF

68.2 KB Created: 2021-10-01 12:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 811a870e084543b6ee63deae86005ea0 SHA-1: 76ae865342402df46a9759968c70212f7eff0174 SHA-256: fcd2110e495ff34fd3ae6de278ebace72995af8d03a7f41df1a1bd8c57ab2dbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=frp+redmi+note+9+miui+12 PDF link annotation
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/frc0es34aq7921ooo7vujqdd42/80184251166.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/terex.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16149fb9fcdd90---34473008893.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/fitizakiwekawufurimopive.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/jumaxi.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/709111848.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///molevopatanevapiw.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/a6iibuhme4e0q9cpo4gk3dhikf/gepidabadipan.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/gabobapo.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/67645488936.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/gikukexosix.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/82401446177.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161428b5e7df52---85000532044.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/93478447555.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/pojekuxo.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161386b1e5aaad---ragul.pdfIn PDF document text
    • http://houselandia.ru/files/pojowatedujufuvitojuwi.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/85365798514.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/movaxivudoluba.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/sutezu.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_off0000ae5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC670 14756 bytes
SHA-256: 0067efc20c2b2241c9a2e39f9601ed38d393578076f92de0244f972d613ce3b9
font_02_sfnt_off0000eb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 10596 bytes
SHA-256: 4cfb4b6482780be9830408ec1507fa7c4a65ce4428ca89f554b71d67aa46a1b9