Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ed6408744dfd68…

MALICIOUS

PDF

81.6 KB Created: 2021-10-04 20:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 82f38e3a398017a5c89b0ce3e3933ecf SHA-1: 00647f09b8f7ebae45d2f857290c300838c779d5 SHA-256: b3ed6408744dfd683ca5b362f2cf9a1552d5958b1d03c61c467713b5efb50e9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, directing users to numerous external URLs hosted on potentially compromised websites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure the final malicious destination through a series of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=characteristics+meaning+in+bengali PDF link annotation
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ac9b2b1580---daladuwivevetepofi.pdfIn PDF document text
    • http://adfaveo.com/image/files/20210921_212943.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/kawijosemubawovarijusim.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/jizesovepa.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/q7h8pjrar51qcr4lpkg6msk4i5/15616026016.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/35716450892.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130e85969db8---76972448760.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/58925557598.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/wodigagogezusib.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/17950983560.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/dosalovevasepewowefezi.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/42205980354.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///96720630292.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/54220835416.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/78082456400.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/15272198.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/688649219.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/73381946383.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/sfi9acg32r0jn3g8kr84tjftgm/kowirenowerixerafamiwokeb.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161434d6d827d7---9171908421.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/xivotikumukakilamobos.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/76496839989.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/61c34901daac67618dd9a9f56d1b3dd7/65847622172.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB06 20140 bytes
SHA-256: 4a7d8e6050b8eaf598d5945749c6a5c25d3b075460df62fa191ff359567164d3
font_01_sfnt_off0000f01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01F 10728 bytes
SHA-256: bc8f958aeaa4e4230847556fd68fc3371e36f23807c9f2548582f9b63dcfe67c
font_02_sfnt_off00010890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10890 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_03_sfnt_off00011e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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