Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45cbacd349ee948…

MALICIOUS

PDF

69.4 KB Created: 2021-09-24 15:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65d442c5cf7b014f16fe1ac1e755ce8a SHA-1: 03b4fdc6fbb382e2fdfe7f0a6ba08e3fbc59b476 SHA-256: b45cbacd349ee94856100200c20820a42386dd3bb58e177430e5475752df4a50
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable domains. This suggests the document's primary purpose is to lure users to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b76bd38490---44596030253.pdf In PDF document text
    • http://ned.ru/uploads/files/24074436547.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/95350776154.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/6135892b17306.pdfIn PDF document text
    • https://fptica.ru/images/file/detesiri.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/24577354313.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161472aca81e3e---pevuxokekaxixaja.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/46252410730.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/lizufoki.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/turonasaniberesanase.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161398408085ed---27560286357.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-3/20210903225000116997.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/56630291846.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/zifisi.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/o8h0ndevv5b7h4g28brn7upkku/bojil.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/99021585439.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66175010082.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/50033899983.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416944e95ad---kebebemelom.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/kozopavanebuwopun.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/5734058778.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/26728018469.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/taxudepamaravemolepabun.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210907192513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=chains+of+olympusPDF 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_off0000b119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB119 10536 bytes
SHA-256: 5a73eb3869a076052f08a59ccf26e30049a7594e57deb305615179b29db9fa35
font_01_sfnt_off0000c8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FA 15612 bytes
SHA-256: fcb845384fd7a67c39f3f806d86fb6db39c180f7f6602815448186edd2fca584