Malicious PDF — malware analysis report

Static analysis result for SHA-256 32bb864cd5420f4a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 00:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 499c5d5091c87d576e56c820c46eecf5 SHA-1: f53f993ba3a98b24c6db84bc7ca3ec09100af6c0 SHA-256: 32bb864cd5420f4acf05094089a523f3fc22af610e2996d04b9bf135ff6db1d5
176 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 websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://messtores.ca/fck_user_files/file/fezotilegawerixiwatuguv.pdf In PDF document text
    • http://goodwill.pl/userfiles/file/gaxax.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/22548447700.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/54840737025.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/8991661296.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/bixepadavorobanewugil.pdfIn PDF document text
    • https://photojet.net/userfiles/file/lakizurukutuxagonokizidez.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/babajelu.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/12748107137.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161463b7d106ad---90583398953.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/55566708456.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/kijodafiwejeluvujutiziv.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c6939d0d2---32739517970.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/derikojuba.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/ketisir.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/goximos.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/zumabujewejuge.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/mipaladavitafuw.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372ed74af1a---38868814650.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/bowiwolosora.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/zemowufabipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=create+qr+code+for+iphone+contactPDF 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_off0000d905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD905 10680 bytes
SHA-256: 76a8a8f28d216f6e66fed9904b50ec63f00a4d8974967e4acc9e9136306205b1
font_01_sfnt_off0000f138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001094a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094A 17856 bytes
SHA-256: 5b84aa6eeda1b3bc0d7a42519959d1f0b26e7713f8ecb93441a2c7589a2e32cc