Malicious PDF — malware analysis report

Static analysis result for SHA-256 502f2f9fcc2d5e9e…

MALICIOUS

PDF

71.1 KB Created: 2021-09-19 02:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 139412d5f4a65d8f3ca11fe688c89402 SHA-1: 07e1c87ed5fa360078554e6bfa002f7069eff07c SHA-256: 502f2f9fcc2d5e9eb8d008a29fc1f08d0e2d499a145b0756de0309e0b6335b49
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drafthe.ru/uplcv?utm_term=sonic+forces+mod+apk+android+1 PDF link annotation
    • http://saigonradio.com/userfiles/file/29983725841.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/xodobakeg.pdfIn PDF document text
    • https://maymac.info/userfiles/file/rubunaganopatedejukiba.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139f8f06d5c3---69070702224.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/vonuxomar.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/lusonuzulugaxomiwukutegu.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/xozotoni.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16134d37fdad4e---6063754997.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/14755300080.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/gedudubuxe.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/84980917436.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/sizavewolobetem.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a295e9b9d---87781482932.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/walobodatunilusirideruxu.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/79658170720.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/42043514789.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/38fcdc24c5597a25f4c0f065aea3e3b7/58949562549.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/8e70ab967d4ed6f69011ce3fbb0fb4d9/wozexo.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/74114661054.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/55903107048.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f45dd0df64---zasexitutazazozajopepedut.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/25256679959.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/wevaxegatijogajusikofenu.pdfIn PDF document text
    • http://iphysiology.ru/upload/gisetodumidumajerebuwu.pdfIn PDF document text
    • http://pileki.com/imgup/file/senatunaragolesip.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_off0000b717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB717 15176 bytes
SHA-256: b599df8cee758daeec764155c82b65f99d7bc9d1fa55cf980fe8a44e13b3e374
font_01_sfnt_off0000dd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54A 10856 bytes
SHA-256: 378abecfb915ba492116bcf2742b1fc34059e256f45b79addc847c8388330ed9

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