Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11e637704deb998…

MALICIOUS

PDF

86.2 KB Created: 2021-08-20 02:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3fd20745c92f9ec31d224b78b8907183 SHA-1: 8cab3593474a37346f0a490eee97ed7e3c6d2d76 SHA-256: c11e637704deb998805a52bddaeb4e590e3d8771bd4ae66b7a2b8b10cb468411
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign, likely leveraging spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077c9afa4968---pozig.pdf In PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/86f6b13bec6da1ea701f50f4d621b281/3495418709.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/nariduvalosexazisafi.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/ff07420a3b994dc534c1221f3d869683/gitudigifom.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/gobeworuk.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda3c5c00ec---22913969605.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/baregidof.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/qiu2g0vqaeil1olk6pjfk7lucj/wupik.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-28/20210528124957555442.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/bobun.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e8c283a32af653f9a9d311bd2171cc78/dazobadukef.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/37911795383.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/75f2096507dd5c79a72f16435e7dc0f9/59198005111.pdfIn PDF document text
    • https://area5srl.it/file/kekizeniwazeviwu.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/delegokurav.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///4796508990.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16113c3ab97221---sijadapumuviribuwajumu.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/37006815038.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f55cedae79cf64a3718ac753e89311e/lukutamames.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/22946300327.pdfIn PDF document text
    • http://watch62.ru/files/files/10245068277.pdfIn PDF document text
    • http://ponderosaclassof1990.com/clients/d/d5/d5d19f6fc184e1fdd834fc62be9f1763/File/wujofevap.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e18cab6bd2---51005922188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=emphatic+forms+exercises+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4cfe359a08b49675d9dae2370b2f6bfd/larojozanumokisavamenilo.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_off0000ead7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 10820 bytes
SHA-256: 7f48351507e9a8b97b9c4999c76decc10e8192b3767f3a6cbd75c393b5413121
font_01_sfnt_off000103da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEC 17676 bytes
SHA-256: 71e9dcc878c76bc02d0bd5366a92437939d33b50bede3dd2fa839a4180757ec1

Open this report in the interactive analyzer, or submit your own file for analysis.