Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd309c686bdeafc3…

MALICIOUS

PDF

87.3 KB Created: 2021-07-22 18:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 5968a38e6d9c0437c46f14218fe5f403 SHA-1: dcff17ef0f64b4df15bfdcb29cb639ae77bfdd66 SHA-256: bd309c686bdeafc34b5ca6296d8b3779ab29144d8e71c2de1ae02ee5f757f34b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://itkaufmann.com/images/fckimages/file/kemekuxato.pdf In PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/fb4a8dbdd6fb03194292ef58f7bf9109/liwozife.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/80928079945.pdfIn PDF document text
    • http://championsview.net/userimages/94502366299.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b462b9a19d2---bujotawamugamezelazelin.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/hhl7p9e2i7m5v5k80gdn929ne2/11916241389.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/78484805495.pdfIn PDF document text
    • https://beaszemin.com/files/97837324776.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/vizalina.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/hpj26gq9ommrgv7qeus182d7ir/27605993768.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758297cc202---23337935650.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/dejubonomokubivanudixumo.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/polugifubinejimifenumigo.pdfIn PDF document text
    • https://digireg.at/upload/64658788020.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/6076246114.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094c07246992---81558624008.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac907a5f511---1319411301.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/powatekigumafinetawiliw.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/lugigekofimezufu.pdfIn PDF document text
    • http://franciscakeryandcatering.com/clients/61981/File/bezidusojozilojukasomenof.pdfIn PDF document text
    • https://oksushidelivery.cl/sitio/public/files/file/86768004368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=to+defend+against+enemies+foreign+and+domesticPDF link annotation
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/wasepabexezakiz.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_off0000ef2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2E 10736 bytes
SHA-256: dacab4ffb7aeafb2eec2540e709e8208ed16d2401d8baff5595536b2c671b1cf
font_01_sfnt_off000107aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AA 17208 bytes
SHA-256: 1a333c480ac74ff0fb8cac13930b2f3a723128e9dc9a9b38df680d42d893fc25
font_02_sfnt_off000134d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1