Malicious PDF — malware analysis report

Static analysis result for SHA-256 f06b252452d4dc82…

MALICIOUS

PDF

84.2 KB Created: 2021-06-28 20:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 316e79620b3cbf4b7f9d701b7259a4b9 SHA-1: 03679b56e2b08ef54276462804e58f717656c7dc SHA-256: f06b252452d4dc82bb44d8ec2d6d00096b5967011c4e014855d250e65aa9e68b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content. The PDF structure itself does not contain executable scripts, but the presence of numerous external links suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbfeea5ec6---90168939232.pdf In PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607121f1e3b64---dijirokimokiva.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/63456e8450ff7eb268b986069dd05e5e/fitexupoxikofaxujatus.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/42502411531.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d50f3940b3f---farilubabezosezilaw.pdfIn PDF document text
    • http://landpas.pl/upload/file/lowalufapepuxonawa.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2160802d1---88937862388.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/88402161162.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79237ba7fe---70431933110.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/72777963230.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fdcca8504---memagodurowed.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/902873a2c69cb6ac8b3acbdee087d4fd/nizitorisowopinoravefep.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/89372099852.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebd6a9cf8e---bibijoni.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a784fab49ae---66049335143.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/49154746791.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608249d90904f---77001135482.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e7757ee18f2ff4fbd1e647b5bb92cdb0/zekogalogebi.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0828429ce6---89902988399.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/7a04faa57003a9962958e32587cf8626/dulunonetogikebaruweka.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608718b64c86c---77902468478.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ui53ram4k8dulpjmjc1l69vh33/dowuraramen.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210610113219.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/97f6410cedaa18cff4066320ab154f74/14068558772.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/vizamewewagamebakinufix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cortical+spoking+cataractPDF 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_off0000e83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83A 16644 bytes
SHA-256: 188db7e8058c5900835dd7f5b939acd753c7d364440c6a63e454e9821d0a3fea
font_01_sfnt_off00011377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8E 10540 bytes
SHA-256: 950ab4f4dc0bc8bc4bcd0b9b30909b5fd01f716e274c5e5a89b03b8c53adbb87