Malicious PDF — malware analysis report

Static analysis result for SHA-256 f871a5a27294fe61…

MALICIOUS

PDF

88.3 KB Created: 2021-09-19 08:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4f1d5ddce0b18c77fd8d5a34835c6398 SHA-1: 8ea2ae535200386625070635737518867af54785 SHA-256: f871a5a27294fe610da39b1a238140f9abf6e994723148e0e863a5e02ac84b06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document functions as a link farm, likely to redirect users to malicious sites for phishing or malware downloads. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'PDF_URI' heuristic suggest potential for JavaScript execution or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pixomot.ru/uplcv?utm_term=english+war+film+full+movie PDF link annotation
    • https://eminentland.com/admin/userfiles/files/ravoj.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210904_015302_5720.pdfIn PDF document text
    • http://sonet.vn/uploads/images/files/22404917202.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/991954a6ca996debc7ffde4af18048a2/kifokukodowotijotiruka.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/ravuwufuzopudulixiraseke.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/garanenezugor.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402befc6fd7---53532896702.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/93461660283.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329bad76e20---93818611548.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/18914366670.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161454ca9da4cb---73008643596.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/baxejevupozopobuvudiz.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/nebalilemikixizozu.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210905170138.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/zeladireregir.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/7006717267.pdfIn PDF document text
    • http://ippon.lv/uploads/File/sawuzafogexazinumakizenek.pdfIn PDF document text
    • http://sns.hu/_user/file/kavusapu.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/suwosamab.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/megaduso.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/42618539670.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/vorurazejutovebi.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/40215228903.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/kekijisejadojuvuw.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/15843750816.pdfIn PDF document text
    • 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_off0000f426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 10800 bytes
SHA-256: 79f191b65870fe1f7b0f6d19daf236135cb4c37b567b8c9b4d9c873a7d125842
font_01_sfnt_off00010ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F6 18140 bytes
SHA-256: c463954ac1c68f9ae75e5067536ac699881833f8fba64b5d79e6e95862b9d076

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