Malicious PDF — malware analysis report

Static analysis result for SHA-256 94858e9f281da185…

MALICIOUS

PDF

73.3 KB Created: 2021-09-15 09:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 715e9c44a14ee2cfb95f2c9cd43b042d SHA-1: 1cecd175a8b53d2c05ef018e6e8cca073598a289 SHA-256: 94858e9f281da185410000ef4a79d2fc872c6251d23a9d4c5b5ae605a59bb052
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic firings and URL analysis point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://tradotel-riviera.com/file/duxapefadevaw.pdf In PDF document text
    • http://arisutour.com/ckupload/files/wovibojisunukirad.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413c83e7d7f---58444916753.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139d572c15---65538769026.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/tojegukapavozumirumavalat.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/wugasipitezipufi.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/kolusaxi.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/lulamal.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/depuwewajejetidenuf.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/girefeturovi.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/95419239454.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/80062182453.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319d3a91925---jegakevaxasijuwufemagol.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/40872295010.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eddb966dda---94534313466.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/xolumokonegowutobixaj.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/73483140968.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/molowotexikujate.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/nisakafazilixumivujusuf.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/bc8adf1a887d9be24264aa4481a760b1/99251256795.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/21499606513.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b391a9de4c---66194505925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=roll+number+21+kris+in+bollywood+full+moviePDF 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_off0000ba8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8E 16776 bytes
SHA-256: cfb67de5695d1e6d53546b71f31b6aa6f8a69cc5b947dfcde79bb1e8d8477460
font_01_sfnt_off0000e548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5F 11068 bytes
SHA-256: 8b9a9b193b8fc325456822ada0e1452a62dffd1da1eb594cac180d9e8e9936c8

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