Malicious PDF — malware analysis report

Static analysis result for SHA-256 de94a68ae5add4a1…

MALICIOUS

PDF

73.8 KB Created: 2021-09-16 10:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c4b64768df9a452486b1f12c9a904cae SHA-1: 7e1674574153e16c2e9e18b271da5dd3dba47deb SHA-256: de94a68ae5add4a1093066c19c6fb0d450483066ffe2531aa0b6cb8dace4cd22
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 other potentially malicious hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The file's structure and URL patterns are consistent with a link farm designed for SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.dogwoodagility.nl/ckfinder/userfiles/files/35647265728.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139e4d38ef---gatabexojeguxirufa.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/fee4d26e5ac63f1ae51c74669970883b/54072670300.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/rugad.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131da69edc4d---94583237794.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/0a808fe591835fa23858e301303a764e/56292947828.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/14022736921.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/wutoxi.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/sarawiwininega.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/lubonorepesi.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/81196633714.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/namogewikaw.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/zodot.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/66346974313.pdfIn PDF document text
    • http://okvin.org/userfiles/file/65684598131.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/megonojusufaxewise.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/bisivozomowafo.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af636ca97d---32453392290.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/22503713382.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/817e8b50dad9f723a42f4e9ec73c61e7.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/napidumizutulosojov.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/zaluwejoluxidude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=potter+and+perry+book+pdfPDF 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_off0000c05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05F 16108 bytes
SHA-256: 400c994be1ac0ffd1d89d54051819e58000c5075da850e5288bce1683532213f
font_01_sfnt_off0000ea19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 10532 bytes
SHA-256: efa4901242bbe8a3ff5074aedcb026dc791d670a76263e5169ae0201e600c6b8
font_02_sfnt_off00010209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10209 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1