Malicious PDF — malware analysis report

Static analysis result for SHA-256 74da5a71b6ad0739…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 13:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 91a9aabdd05a2aa070371300285753b0 SHA-1: 09fb1faf673edb0676a2312ec158963a88e66b5d SHA-256: 74da5a71b6ad07398d7348555639fd52a2f789fb0ff5d120aac02f0ed180e6f4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nadinerogger.ch/userfiles/files/mijiragapi.pdf In PDF document text
    • http://matchonusa.com/uploads/files/mukisapulovezovu.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/3d174cce76ae3c22f1a362559f79a93e/wulokozavofumelux.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/50831726113.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/63i1jfnha02vlqagucku2d0d17/zoxesenujubifupejag.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/kidatapuwisadururaturo.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/9lc9rai14q7k8ckgrh2jb3csl8/93058120611.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/48632999788.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/21896420192.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/pelomutopebedadorej.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/7259151693.pdfIn PDF document text
    • http://voijin.com/userfiles/files/99823645478.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/bojuzojuripodudizaxuvozab.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4a7dd8634241f251067d36ed274cd588/vapijizurerulexamalu.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/16114210616.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/70914898565.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/97012613552.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/totidedixomidejupesar.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/tiduviloxonekal.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609e19519e6e5---74849564020.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/raroginutomumojajijet.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/66256129040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=jaguar+xe+manual+gearboxPDF 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_off0000d87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87C 10428 bytes
SHA-256: 064ee5c7ca6daf58b2a5058d2c64446e359e3271eacc6c3b7d6f5b5dd030fe86
font_01_sfnt_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 17260 bytes
SHA-256: 999986d1be0152666e9f3e65996588a17e30753b02fa0bfcc435fe2ab8fed5af
font_02_sfnt_off00011c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1