Malicious PDF — malware analysis report

Static analysis result for SHA-256 0920113e37c34285…

MALICIOUS

PDF

96.0 KB Created: 2021-08-23 18:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ef646dba0e47b4697f3094c0665c2065 SHA-1: 7196d4e87b0457c9ecf997f4c93721dce64db875 SHA-256: 0920113e37c3428559480f189f587917c2ae1456651351e74ac919745710f751
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8393f2b17---wipegab.pdf In PDF document text
    • https://hotelexpert.ro/uploads/files/jakoluxubad.pdfIn PDF document text
    • https://kar360.com/resimler/files/zoxasugir.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/167ee4167b14781fc5bf768851c2e36b/183904693.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6201f1507---vexizasipazemugexevadaw.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/jhna0gfal02uf5tqgg34f0bk5c/27679356418.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/49150434862.pdfIn PDF document text
    • http://sam-global.ch/files/file/88357386023.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3ed1516729a5400d7cd68cd4d95708c8/zoduvurimewuzorefevise.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/mixegivetazeremiwudip.pdfIn PDF document text
    • https://parc-hotel.info/file/wofoga.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/d9ee420bba4bc1571132940c7eec9013/teporurirewovenaporawowus.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c7338a853---monelimobefojanopeb.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8b5139c5f---59403331335.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160942d6fb9656---85212137903.pdfIn PDF document text
    • https://dm288.rs/slicice/file/sizilakixopumapumop.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cad7303dc88---17137784592.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/ralojurarosoteruba.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/85787991394.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/55443583686.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/qu9gauhuhcihhno4o89f2c523p/26721886177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=path+chinese+philosophyPDF 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_off000114a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A5 10484 bytes
SHA-256: b9b20ce50745759b038b2b525a71b585dfab090f2fe06ba5a9ca17c29d5e1dda
font_01_sfnt_off00012c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C75 17156 bytes
SHA-256: 840b2a8cd715d19ea75c88133da35059916c2174ca115920fbb7635fc37a545e
font_02_sfnt_off00015944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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