Malicious PDF — malware analysis report

Static analysis result for SHA-256 917c3fa7ab292d71…

MALICIOUS

PDF

84.7 KB Created: 2021-07-13 22:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ccd61aba7c90e7c66a6e46f8c684e3a8 SHA-1: 1986bf496f638f8ccd76d342b46113036e7c6526 SHA-256: 917c3fa7ab292d710d49f9cbcccae427bd2e53d0b710d7f9be746de4f1d8f3bf
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 0.9964

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://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/jspeuuhr69s0mt3om5hvuu4mut/novozapikawesujiwafukoka.pdf In PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/17088373472.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/4r7n2bcaeib83csaom6dhokpem/28732329176.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3f7ee4f00---zejolobarixapele.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d8856a9847bf6323172f4b537e6c5e02/28751847760.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fc60833ab---44029312381.pdfIn PDF document text
    • http://dzbnf.com/upload/file///30917703061.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/nawarugukunujagob.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/rukorabuvoganuna.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/e83ff252bd99fba75082e2ef6621acdb/vilaboselomusasukexe.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/59359898301.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-07-13/images/files/kotamemuniwuru.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607611a10942e---pijutazepofe.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/33gcrn8cuif0aoeng84ojc93o1/genewe.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608194965a302---51871970006.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/ginulejireli.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/26567649977.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1625871573.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd001924f6---peral.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/30528740611.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/4c2c7b84624b191f0f37191da364e467/pujez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=spider+that+looks+like+a+tick+with+long+legsPDF 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_off0000e7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEC 11044 bytes
SHA-256: eef3cf07a644a298b2709f0bddfb8f75d56de4a7dde3f20da4c74bcda15e0c95
font_02_sfnt_off00011969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11969 16944 bytes
SHA-256: 425ef075fae0b9c89250505253b18d3e2fc2921c9f4123a86ca2923636bdbafe

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