Malicious PDF — malware analysis report

Static analysis result for SHA-256 38647e9a7bf03aba…

MALICIOUS

PDF

69.1 KB Created: 2021-09-05 18:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ee29f3fc0dc116a8c4813cb17e6bc77a SHA-1: 9cece52372e804e6a200e36edfc74dd737d4cbda SHA-256: 38647e9a7bf03aba26d3fd86980a4b2c315f73b1475eda4ccab2c9a2e33b6791
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The presence of multiple links on disposable or compromised hosting reinforces the phishing and malicious redirection pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607674d184e65---turefune.pdf In PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/24748816086.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/9925381792.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/dojijupizofoditumuteri.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/eea755534e3e381a78e494ba4da5357d/sofezame.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/964e0008b95b8c201d5b45f534b350e0/58323055908.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/2995147417.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/53134641093.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/66722924541.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/29824546141.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/xegabixafufowazirusepole.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/68026020420.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/42746095386.pdfIn PDF document text
    • https://visualarchive.bg/files/mivejusubili.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/rujufeduwo.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/givememapebokavepaka.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/kovozup.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a58a93c5b19---nulemezisaner.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/ild2r5puv334r9cvdn9qsq7ef7/23708521246.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/87119228203.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc7ee5ea878---29216585607.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/40323528085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=educational+supervision+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/d1624a286dfca10f3410115e6657e3f9/31801210416.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_off0000b0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AB 10764 bytes
SHA-256: 99de788d4f703acd057c576b6f24093867585fa3b9610c8c4b0a65a9b0273091
font_01_sfnt_off0000c994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC994 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A6 14936 bytes
SHA-256: 428a72af6d33ad3611046d10ec18278cb23df0a0054e8d7265432ea300981050