Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6519c910bf97b2…

MALICIOUS

PDF

93.0 KB Created: 2021-07-26 10:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: dac13dbeb2f771b490c3d0b40af7b7db SHA-1: 9eb6bd900da072f9ec28a1cc585e40d3d5639f33 SHA-256: ec6519c910bf97b226bee5fa9c353238af6308c0ade9142d51c288e9995ea069
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a QR-code lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ithaca1960.com/clients/8/87/874e400c25abfb160fd1c0cf9913fcd0/File/60205423509.pdf In PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/fbe6ff68dbdba7dae28fb8ead1f52124/23158584255.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/32adb8e9592b768c6d645f8633fdb39a/18420033461.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/27006449713.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/916e4ff91fcc32e50e38a69788a296e1/zubazezufunatebibol.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/zotev.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6085d7301---7425892915.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cd7b559d497acb2084db7c558fcc90a7/buzitewopomifi.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/waraxasesiwofu.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/sapozazapowigisi.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ad51d1c79baf4592fa78f6eb0c79fbbf/popopaxe.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/74515332378.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/16368868311.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/filita.pdfIn PDF document text
    • http://modero.vn/upload/files/letefufudebexarofanok.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/71131039006.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/kosutitumixeta.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609ab2b38ed8d---fabonozek.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/bagosesujureve.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a364bc5898---dojujofasi.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/38253138121.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/gobubedagogadapafokaxel.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/fajajo.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/romisaxuvavoxexufab.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/90190997921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+turn+off+push+to+talk+on+discordPDF 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_off0001050d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050D 17136 bytes
SHA-256: 09cb3a7d7f1bd4c8e0df66872fabd7005c8ddf983e027c5cf07014f9b51990bb
font_01_sfnt_off000131e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F8 10852 bytes
SHA-256: 9ce5e357236e0c4a25434b875f054259d018f4e489afea0765a9913d6ebcf70e

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