Malicious PDF — malware analysis report

Static analysis result for SHA-256 59199314b9c91990…

MALICIOUS

PDF

84.1 KB Created: 2021-09-10 16:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 048c866cb51fa26e4e22b542a952b7bb SHA-1: eec2c774f72aa306152a479a9603cb6a89d4ea33 SHA-256: 59199314b9c91990a1ca0b34fea639fc616fcae60cff562cb3fa6de1dd9e147f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics strongly suggests the document's purpose is to manipulate search engine results or distribute further malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://epwuae.com/userfiles/file/79257984652.pdf In PDF document text
    • http://dellalontra.it/userfiles/files/17811784041.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/54849374382.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/88737898276.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/32079628207.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109062032016179.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/39850886631.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/84705445599.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338e4488040---juxam.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/78421362686.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aa3d55eea---bekalukusudaguxuboja.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/raluf.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/61947874149.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/41197227475.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/60206560978.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/pudakiga.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/pikidenene.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/lukimililiforar.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/48591111894.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/gatibenuseduvamosavuna.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/89052390409.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/xagokiminijom.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/nisoganu.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/6831960013.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135114911c75---giwufoduxiwados.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=famous+olympic+volleyball+playersPDF 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_off0000e0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CB 19560 bytes
SHA-256: d22735d34f87d86cd102856ac53ddd6173e4af83c7d424ee624d6f834cc86a4f
font_01_sfnt_off00011257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11257 10728 bytes
SHA-256: abe96100efadb057d382f9a296bb5600a33b885fd282d7ec008b201ec9f22988
font_02_sfnt_off00012ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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