Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90d3c270288baae…

MALICIOUS

PDF

74.2 KB Created: 2021-09-04 23:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 0cfd4a2895acb1c77e9e4044b590915f SHA-1: b996c40d955823eb66b4df3245a413b1d0229890 SHA-256: e90d3c270288baae353bec31775dc304f00ae8de7b575e8115f4a1a73a8b422d
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://carparts-fixture.com/file/file/83435357501.pdf In PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cbca189011c---mikamovanegojapifewesunog.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfa8bb8b7a---zibib.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16094bb6241c3e---fiwotejozitele.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/vuwajuluzewuxosupuf.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/bfcp69416pbs0f276kepgcfoec/27012407702.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c27d2b086c5---jafovuvafelis.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/q667d0luqpulq2fknu9sqi6k2r/topuxizo.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/zekuwotisiwikogidete.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/52177826077.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/tonuxosudisim.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4374b61dbb2682ed6bd64fb430cbdd99/najigelano.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e783b44f1---8586073431.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607476668664f---bisigiwenabitokoni.pdfIn PDF document text
    • https://primer-spb.ru/files/files/xudidutulevomuvogise.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/jitoruwepef.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/piwunimalojataro.pdfIn PDF document text
    • https://ecoretras.com/file/20570116514.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/gisebixazuxibufexi.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b9975da18---velibojax.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/b78e4a57f7afae484b2d900c424336bb/51696644786.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/nadapawejipanojumixe.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/tqdh7rbpk266vd45o5ad1smho1/lokodirevidaji.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/julurabavex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=eustace+mullins+secrets+of+the+federal+reserve+pdfPDF 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_off0000bbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAA 17160 bytes
SHA-256: ee060db7bacac730c28c3dac9558512e4aa1928f588e148ba6c533b4f469af25
font_01_sfnt_off0000e755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE755 11036 bytes
SHA-256: d935b3b576a07412329892c0a376a1c0d5ef55d9b341e2dddd70dd8e1dcf6894
font_02_sfnt_off000100ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1