Malicious PDF — malware analysis report

Static analysis result for SHA-256 6094b2d0e2b22e27…

MALICIOUS

PDF

88.4 KB Created: 2021-09-04 22:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 73327594d358efee456434043eb63a3a SHA-1: 05a3b1fab03b3372679866a367d4b9aa62218bf1 SHA-256: 6094b2d0e2b22e27f7acc86a3653d37e3c47ea0b5ecb1f5ef4ab87b5b3061c38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The primary goal appears to be directing users to malicious content or further stages of infection through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://butyfarm.mm520.net/userfiles/files/jutodanuzadesodozakujolo.pdf In PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5388e84a96---sixemori.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b8cd92602---44173591003.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/76345474431.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/mokuzotodopijenazaxiriz.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6866dbcdd8---80323303251.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/safitotawomisu.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608632866706d---rowuzujexe.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/67466896847.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/88205213803.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/0e4dd2c03175981cbb5fcd1cc6a2b2f1/66730930127.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943434657ca---kifipuzosajovulepe.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9bcd035cf---96604757225.pdfIn PDF document text
    • https://2acontractor.it/images/file/38527102916.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/wiveronavisafunozuke.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/37315488687.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/45991920671.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/9u2qh3fvhpgms7sfsvuebg815e/sizosuvutidaka.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/65244253943.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/tutowideguredezojupatari.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/zemilifomukivomeno.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/a87kdflsdiabg55nv8snaht5c4/19685691095.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/subigonedijibabokozox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=dictionnaire+de+rimes+rap+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_off0000edc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC9 10736 bytes
SHA-256: 665dde3ce2086bd4baf75b67437f8a0247b206708fe05921d81f47cd8c6df69d
font_01_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 21444 bytes
SHA-256: 40e1753892e0317f4f73b48341e10b584da8a860e4163580b70d4472328b5b26
font_02_sfnt_off00013c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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