Malicious PDF — malware analysis report

Static analysis result for SHA-256 925f985dbd3b4ef8…

MALICIOUS

PDF

79.2 KB Created: 2021-09-21 09:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4f36f487083ef1d296fd11e7603689f3 SHA-1: c4cfc357662ccb3dc73a5cc2f84fb1095fdc5f16 SHA-256: 925f985dbd3b4ef8a169eb7706af1271d367462701eb74bbbe52c724c20bf7d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://groupementpecheduloir.com/ckfinder/userfiles/files/97041937475.pdf In PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/mikulakateg.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/53993231277.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161415b2b93be4---91607127905.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/ludatumimabo.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/velumataxu.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/44165533900.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/50079916436.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/govelikuvid.pdfIn PDF document text
    • http://youil.org/userData/board/file/16038945152.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/tizinada.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/3d176e88f7fae9387954cfd89ac9bf92/xufisasedaxadupu.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/xovakuxefiwatodevegamen.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/44576302372.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4a4f4bd49---38468257944.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/o4l9r4i4pjfank44bgsij5ptv1/19048000280.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/bobix.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/tivebewa.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/gaxom.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021091523714_259125770.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/puwababuwisepemanutupuza.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/lelujomekomilufi.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/todosamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=def+jam+fight+for+ny+psp+isoPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FD 11004 bytes
SHA-256: 38ad35b4ed39cedbc0be2cc71d8ffa5ab55a5aa9b3b76b41c5833326a9da03d1
font_01_sfnt_off0000ce64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE676 19028 bytes
SHA-256: c7922ad4a4cac26e28be5025953cc2771ed8a7fe1e8a7d4a3e0b19bbba50d5f8
font_03_sfnt_off00011766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11766 16640 bytes
SHA-256: db340cf0fda178890b3f5fdb0004e6d4b4ddf8ca9c5e50523e21ba12785138a6

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