Malicious PDF — malware analysis report

Static analysis result for SHA-256 5243c74f82c379a2…

MALICIOUS

PDF

92.0 KB Created: 2021-07-30 09:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9914f283b53fd33d0680eaea022b804f SHA-1: 40ff538073d82d275e03471e014c0dee1b03d308 SHA-256: 5243c74f82c379a2337f7bb5257162cd2b874cae7e8a4034479812afcff11782
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised CMS upload directories and disposable hosting. These links are likely intended to host phishing pages or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a084fae1301---mugasu.pdf In PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160864f84d7bf2---90992878131.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079b1ec956c3---63377678738.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608102c6a04a6---pefotazukijum.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/ccef852cee1b866101672c208004136e/vivuzesevekokupu.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/dc4ab46357afe1cb99775cd8443b0c21/89250390750.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a98977eb4---88081921611.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/lonosakuruwupeduxumebil.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/juluguzenujoparo.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/penalesexefomiwopuwewir.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/nodekojisuf.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/38669309777.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc318e596b---87409650423.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/zepubatobotafe.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/14035407740.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/juzawib.pdfIn PDF document text
    • http://asvpp.fr/pdf/gadamagulire.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e13827451c1---98232048534.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/fetegarosagufetafep.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/237275580.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/995150352636d90d0b12f4281b8b2e07/tapimez.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/zikalamanapivuvijubibagux.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858cce66957---83636487928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=productos+contestados+de+la+segunda+sesi%C3%B3n+del+consejo+t%C3%A9cnico+escolarPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44C 16324 bytes
SHA-256: 0ca7f33d6eab45fac5b8aaa06550378dc2ad130fe9aa33f2c93ac02ca5970b46
font_01_sfnt_off0000fa9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9F 11068 bytes
SHA-256: 111036400c7a46fadff68b5b13eb3818bc91ee07937577718a74dcc6b84f30bd
font_02_sfnt_off000113b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B1 19496 bytes
SHA-256: 2d99718abacee19e749b041a75440a69a12e10770c0aa62519bfaf2aa5f6e522
font_03_sfnt_off0001454c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1454C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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