Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d849afaebf17a8…

MALICIOUS

PDF

93.0 KB Created: 2021-07-04 16:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8217959ab3a6c39987d7b810fe0301c1 SHA-1: df0ea2346edbb2728c05e902fdb83b11b081927e SHA-256: 78d849afaebf17a8d83c6ff4acac6ef7f7468b7174a1371362cdbfedf5c5d55b
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate that the document is designed to host a large number of links on potentially untrustworthy or compromised domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/art8jhsfible0240dpb7t1thu0/finewokuxifatagow.pdf In PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609af760d9ab6---9513467736.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/qohb40jjv7ti4gdnpob75j6jn0/lulopufokabokaxitowiwija.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/d4330e3a85cbbd680ee0b9135456757e/mujuwetikexen.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/25648949972.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/81d5b67aecca98e85449f3efb0edb49d/64955561261.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/34815144853.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/wazudopedixezedoj.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/lilivixojex.pdfIn PDF document text
    • http://jimmartinfamilyreunion.com/clients/35696/File/12870937860.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/48300383588.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/22929640800.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/4331010791.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/buvunuwaw.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/fatenabixola.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/tokupefaketa.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6862aea47---2712344388.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/1686243537.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7772240bb---85847352774.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/21e282d7ccfab9f3f1932d7ae84cff43/86154329733.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c0e3d457c---66636012613.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607819a6d01a9---9677602112.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8b9bc85d9650b834b44e904b939a0a43/36268416326.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/719dd6086a5666afa91da7e90a77ec43/66389030404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+dust+factory+2004PDF 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_off000107eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12002 10828 bytes
SHA-256: 6f92ae770e579dced8a378255d07466ec42ec5f4b099b527773c17f3083e0f1b
font_02_sfnt_off00013947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13947 17480 bytes
SHA-256: 78ce25c652a5bceda9b4a6299466dc877929c3b0d3581f46c37ede8d81c3772a