Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b7b0e61172709e…

MALICIOUS

PDF

74.7 KB Created: 2021-09-17 15:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7bbdc9ee6043cece69c75db74fc2ca4a SHA-1: 8a0b9683506434200df5f0efc3fefeebf9c4b112 SHA-256: 70b7b0e61172709e2e21cc2b2b52eb8d9fea640f962e32cc08512f8855a1dff8
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress uploads and disposable hosting. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The primary function appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=pokemon+for+drastic+ds+emulator+download PDF link annotation
    • http://kunjipsc.com/uploads/files/91545457372.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210912005129.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///retimogewa.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/zamede.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/69102666283.pdfIn PDF document text
    • http://zenithmetals.com/files/81788288108.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/e3f04eff8ee60e31a59fb272cfd1e3e1/dagatugo.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/gexajitumanukuv.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/jupiwovinugifawobov.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/77056084826.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/tekanuwagujerivesafamo.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/49789440417.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/denesenuxudowodadanaj.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/pisozegitakeko.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/54998770981.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/votezadupulijidod.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/6bkvs548065jknvamhao0mr8ls/wewifezibegenorerasedi.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/hktqgm8h9uhhpq0s8sbu3i0j35/58987992275.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/290a874568493aa285e7ee53a9b0248d/wojifewutorasudegutaj.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/lizikaxiwomajikor.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/11c374d305a50fea2f790e708346fdc3/47464924175.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/sixumamulodudanejogibijun.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/713f3971167bb97f46a8da331467859b/40820662086.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/45956068255.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_off0000be4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4D 17408 bytes
SHA-256: d2bff2db62a458b6e3299464bcdf84b1fa2693e7d416d8a00b63723057b88f29
font_01_sfnt_off0000eba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BA 10916 bytes
SHA-256: 285a225de0999d9f20176e02c359303a3d45b8499d56f7ce3c5cc616e380a386

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