Malicious PDF — malware analysis report

Static analysis result for SHA-256 14478278447ddcbc…

MALICIOUS

PDF

88.0 KB Created: 2021-08-24 14:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f9e4f91ff608e89900620c4f14a37209 SHA-1: 83302d9107dbb66b96ae7b098958c9a794fe4387 SHA-256: 14478278447ddcbcd8e5d735c31e9e7fe7307d6398362100e7e96852924e6234
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 external links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit vulnerabilities or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ccswcd.com/userfiles/file/folezatarokow.pdf In PDF document text
    • https://eletvital.hu/uploads/files/66445031739.pdfIn PDF document text
    • http://cs168.tw/upfiles/editor/files/70047151507.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/82639646516.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b86edb91e2---77129780097.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4d3f94a10---54507171695.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/tiguwagulepijugoke.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e58421181f8---salemogifupokefeximam.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/30433942767.pdfIn PDF document text
    • https://ptogel2.com/contents//files/kidux.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/12217084680.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffad58f8d3---losirutebodujo.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/2296002016.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/9244ea740d100a33bb82b6d1b901043a/powojarekafujatamonetaz.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160907159cd966---22103467608.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021063003102873499.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/094e929f15b2d6ddc585531b9e00cf1c/fekusugujixuwewa.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/xaxurolatewolar.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba76b2d41ce---14648000535.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/menapukimi.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/26817721320.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077e6e8df2ea---49889127685.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/ketoxo.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/wuzulibewobijog.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/1b2e676ea5f4f2cf7aa6fdd8d20bdb63/kifetefezixiwemuzabov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=diminished+blues+scalePDF 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
stream_004_off0000f40c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF40C 10556 bytes
SHA-256: 785154abaef105b2f651672e5de601d4aaf9a01a031da1e286eff7c56c4aae13
font_01_sfnt_off00010bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EB 17568 bytes
SHA-256: 5607a3aa012d6377330fe1956469edd6db5b87fc6d7b84f9d40e697901c525be