Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92b62c4ad438e79…

MALICIOUS

PDF

88.7 KB Created: 2021-09-02 22:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 92125f9fec44fd7fdff170dc25476931 SHA-1: 4ab84cca679b4deb68e9a296a710eebec03ccc17 SHA-256: c92b62c4ad438e791cb010ed8ff78d22e01de30a3fb43f6a1ad3069b87631b7b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://www.enredmail.com/templates/files/idCliente_/file/12658545917.pdf In PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/65ghapa1mb6113gsd3fid5j4b0/26310114613.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/v1652kro5256au7h64fo8v409a/mabakotuvugozuget.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/tejotinegijumurakukam.pdfIn PDF document text
    • http://usa-ex.com/57227272.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/wadulamupamaxiroxidisiza.pdfIn PDF document text
    • http://potya.com/vanadijubabi.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1061ee6939---vavuritubekurabudo.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/65f899a3ed94143a29222d3404d05624/ragositakoxotogesusuka.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1612679fd93502---54992219552.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/94743140896.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c131b9d670c---javogeg.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/84300049985.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/mimuf.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/lorodotexuvafobu.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/91793693073.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/06d7k1ks0ebm6l7i7e1h5beiv9/13769648599.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/a3ddf1dcebc5dd67445a08bbfcbc5db2/72659428446.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/14773046619.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/63981567864.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/xogulipe.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160703f716eab2---lifobilazexebemo.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/56348694138.pdfIn PDF document text
    • http://cloverdiamond.com/file/robenif.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/pupaxovup.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/lixazojapevuzatilate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=shadowrun+5th+edition+core+rulebook+pdf+download+freePDF link annotation
    • 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_off0000f056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 18944 bytes
SHA-256: 4bdcd00200b8537a6fa6fe3a0060e9f2530c7711ae8fb3f174de485b802c73e5
font_01_sfnt_off0001227e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227E 11176 bytes
SHA-256: 57e5954910f56397fa398f683dd0f99991c5f21ab3f842da69e835899e5a9152
font_02_sfnt_off00013c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1