Malicious PDF — malware analysis report

Static analysis result for SHA-256 652d9c39f6b2b712…

MALICIOUS

PDF

81.1 KB Created: 2021-09-07 10:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5c4cf6eb34ee02a70909504289c364bc SHA-1: 6e43ae322e0bbc6e3272427624c0cb33adffc1c6 SHA-256: 652d9c39f6b2b71253b9ec16c4f9d2bd27e5d93ef2439be0ca04d62bd3d7ccd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common technique for distributing malicious content or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of numerous embedded URLs on compromised infrastructure suggests the document is designed to redirect users to a malicious second stage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/bnr8uh5tv483ec47griag3h0m1/rosunisaluguzem.pdf In PDF document text
    • http://ampletrekking.com/userfiles/file/tafudulo.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607273ecf1976---38695699340.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/45668af462afe0c2758f20dbf0f0601c/lumesesuser.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/74b53fe2ea589d88b3af35622328412c/99044510553.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/26609027781.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5621e0d544---robusafemuvuxilexutopi.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b331cd8d570---97301841479.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/7c30a95127df0f6da53aa2bcfba83eab/33892447703.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/c81b4vposud0psp9u4es4vvv3c/91482594109.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/pai7gph2hkgblcauuf6to99r2p/65815768826.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57386624928.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/neguvox.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eead1c1e4---sebexofav.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/6104002733.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/lijepole.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/23501980439.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/10228989400.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/5e713e9e8f796ddba7e9a324e9c6fcbd/gatekagiselusozugojowife.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/xizumirunokorenusetif.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838db593630---velonobov.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/93832629981.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/lurawujat.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/cfdb967faf001aa42bb960f1d949d0d8/25487518961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=area+and+surface+area+worksheetsPDF 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_off0000d85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06D 17472 bytes
SHA-256: eb56c00a08df09007222e8076685ef94bdcdd80253882248e9235ecf53f822da
font_02_sfnt_off00011dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD9 10692 bytes
SHA-256: e39c5509b391d3970174f5b888b6c46f280736f20ed068da557e57ca0f4e3e0b

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