Malicious PDF — malware analysis report

Static analysis result for SHA-256 bedf8e5b1ab52e48…

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 07:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: adebe6629614612e7b10db01399591b0 SHA-1: e2d81775e2896c5cc7edd4f2fd5f53cd42175e3b SHA-256: bedf8e5b1ab52e48c2c8a340f61654b6ea205fc1bd7fafb46c9b0cc6edbf6de8
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to lure users to malicious sites. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://merlegdoktor.hu/tmp/91834841498.pdf In PDF document text
    • http://ausafe.net/images/art/files/kujeposigijerexogitapu.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/zojotapanokidugasa.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/20145814775.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e609e74b90---semegegufipogejuxumi.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/8081783997.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/47476513584.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ef6f65784b5b87f9cb5d6063df2bf456/85223006865.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/70382466885.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/vobinesasuloziwegusafe.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/eae2d5b683847e106ee371298682fd76/fotixududoliwexilinusez.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/10879094502.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/30345081168.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160985d02adfe6---xotuwagobafipanukabuv.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/225574c3b59ef32426f3de46c9313179/23635752217.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160813560dc7a4---47594608382.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/70493655282.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/44769504456.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0507ef68abe6b54eb82cec63cb801df1/jerididadedipumegokoxima.pdfIn PDF document text
    • https://mszukam.pl/dat//file/zidabu.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/bae951f1315eae975ca19096568fd4b5/pejobaj.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/53502981786.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/siwikabaxuluxulejibidolum.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/34323978096.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160771ed6608dc---worajuraxifodujivekagopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=network+cable+crimping+types+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_off0000d2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EE 17452 bytes
SHA-256: 10f4ed1134d0291e9a82177852a24519ca97e76829d1601b5f990ccc9e62b7ca
font_01_sfnt_off0000ffe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE8 11372 bytes
SHA-256: 7da50aaea62214669e02c751db461cb2b1f4eebc667d8de24d41ee4db3e686f4
font_02_sfnt_off00011a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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