Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c99804dbef0b1ab…

MALICIOUS

PDF

76.3 KB Created: 2021-09-04 03:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7dc1591261252bca32e0ae238c3c83f5 SHA-1: 5aed5067304d028e724dbc1f9646fc6380bb1855 SHA-256: 9c99804dbef0b1ab7ba5c1cf8c3279acd4a4459001b6309617912ec4477ce88e
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, suggesting the document's primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/57766577697.pdf In PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/15529812361.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a1bd4c10b---23803539223.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/83063464328.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ed87cd7b6---tarulawap.pdfIn PDF document text
    • http://babamoleskine.com/files/file/78259920164.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/sexedutezifarexesun.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/d6807121a0b3a300f53c189b0bd04e95/57344588719.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc67324db3---32980702014.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/36993421350.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/56605249196.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/2045672822.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/padija.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609473c18a338---nomawapiziwurom.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcdd6301ea---jutozimunipiraremevur.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba42996e08---lomujekaj.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/88937968920.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/26382283701.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/80125888052.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/23057821221.pdfIn PDF document text
    • http://viorina-deko.com/images/file/72916014675.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2d926e848---pekifufubugorogikaxapifil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=quality+education+in+africa+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_off0000c7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D0 10716 bytes
SHA-256: 0af1dce0dc1c68c9452181b2a20367458f88b4d5b3fe649a32b657d4a716a46c
font_01_sfnt_off0000e099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE099 16928 bytes
SHA-256: 194470870410e7fcd3d7993e23ad86b9e7736cd95f1f16078a0c14c58f7fdad0
font_02_sfnt_off00010bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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