Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0d6d0e9187c3b0…

MALICIOUS

PDF

90.7 KB Created: 2021-06-25 17:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e8d12c4af300ae6e173505167c0f892e SHA-1: 8e8c0db1b4c23b93b42f9e3fe0208c270106aede SHA-256: 4c0d6d0e9187c3b0f1eb2b9bf02cd865a021d859273925fd3780b2b3ee522b49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified the document as a link farm, with many URLs pointing to compromised or disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://atphp.ch/userfiles/file/19370242365.pdf In PDF document text
    • https://anandamsanyal.com/userfiles/file/5758672858.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884373e2286---12273938324.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/d479ac176087939288e5d79365f43eba/25350869194.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/csu6oubtjoq48fokided2ae5cv/wotonozomafutixagig.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/litorokiduxexilowug.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/filugozaxukinolewososa.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607964b25b42d---46088865764.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/sagujaxabi.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607c768430401---52108709350.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/dajudurodipir.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/c62045f6de562a9f40a3538478cd1965/zogobudoxe.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd59eeac78---vonaxanurarav.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/kimuroda.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/jenojapi.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/58818602174.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce28a11fe4---jafexegeke.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/komijobolunitimidekuxu.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/muralidijajivodumolo.pdfIn PDF document text
    • http://kotolantopeni.cz/file/busorevirenarifema.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb4a98aa55---jevajemevobodinaj.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b41227a7de8---gavojosarabilabif.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/f1jqjmt9cmn8j4p44b1thtog9p/palefubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=fallout+4+polymer+coating+applicatorPDF 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_off0000f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB1 19064 bytes
SHA-256: 659bd53e067594921c883a6c94b7899b0fefd90008969ee7f23f28b5a8762a7b
font_02_sfnt_off00013b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B44 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_03_sfnt_off000143fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143FB 10820 bytes
SHA-256: 4a9874fb3b3a9427b2cb2ba14b41b63c7218d27268ff38ab580e34d7ff775652

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