Malicious PDF — malware analysis report

Static analysis result for SHA-256 03951b9f24da42ca…

MALICIOUS

PDF

91.5 KB Created: 2021-07-23 05:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d5119aabd7d5a1bc64b3946824d8334 SHA-1: 7dad18eeb6dc5437812150c6a247210f57a2b928 SHA-256: 03951b9f24da42ca8152b5601b11a00fd9d7872734ff90dfd0f83db000317a43
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive link farm is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2128888959.pdf In PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/8f49a0a1c6bb2340b1ebbe46d7813f4b/meriselevizegugidin.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/n8lm4i6s73ri8jp0ntje3h4k06/56989097555.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c52206624---jivikavenizu.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078f3a052dce---kexorusazegumutunuzo.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8e10c22e0---fowisuferozodez.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/182316eb930009cc6ed33912695c3e84/69662556811.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/7hte157u0d2g1hikf5ugfai2k3/vowesewabesozu.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/popogojawivasolimexowuro.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/41045282ba88d20e5fb18cc1ca65672b/saguguxobuvelixufomus.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1bfc71cf0---86620776782.pdfIn PDF document text
    • http://riversedgefm.com/files/file/wukekuxajeku.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/litukedefiverufuzosimafiw.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/73272196235.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075a93b5152a---30832373462.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1622531666.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/140853465e24a9ddf3045af2c5f0a691/35360997999.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/58046128607.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160be563c9baea---riwube.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/77379235934.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078cab24060a---89060687221.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/wufugip.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/gujoruseke.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0729cdb064---77601817127.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fba43c001---sijik.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/uu5j2ljraupgp6r24h89dp4r9r/dafubewedavazagigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=df+to+json+filePDF 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_off000103a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A8 10076 bytes
SHA-256: 51d8dca8b1d3dfb589b18b605a4c9c4d0002f4f61010a1daddd6ee78b014f544
font_01_sfnt_off00011a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A22 17564 bytes
SHA-256: 3c78769f053e94b6fd8b85ca4bf9eb1bc2da6fe26585080846af57ce6ad706bf
font_02_sfnt_off0001486b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1486B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1