Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8118ec854c58a7…

MALICIOUS

PDF

69.9 KB Created: 2021-09-14 02:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 39bd2fa50ed0751f56ad167a622a9748 SHA-1: 8e4705844dffed28a493b89742e0b3c69e7fb986 SHA-256: 4d8118ec854c58a7862a84f3dbba9776e3366a8deb0d669dce8b0bfbc5aa99f0
156 Risk Score

Malware Insights

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

The PDF contains numerous URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e61c860dfc---sudun.pdf In PDF document text
    • http://finproekt-msk.ru/userfiles/file/11365277334.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6c57a60b7---18361855372.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/23153463596.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/7053039503.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/30886085621.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/95232785929.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f10cf5b33b---16084665305.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/98460438475.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/punugogive.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/lafegizimavudib.pdfIn PDF document text
    • https://totounited.com/contents/files/94352920865.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/sebigezemazuzu.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137ab583a433---66402393665.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/41786150857.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/fotixulukeguvaperesato.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/tuzuwemojuxinewa.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/vexafiwemabinimononetupi.pdfIn PDF document text
    • http://infunplastic.com/d/files/6909309718.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/11213355750.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/62491652032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=laravel+get+environmentPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/livaxibatin.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_off0000b321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB33 15656 bytes
SHA-256: 282faa7dd4ff29f76a7cfe6c5aad7fb5829419c3aefe71a111b01290cd9664fc
font_02_sfnt_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 10308 bytes
SHA-256: d8a96d4fb6cf58b332d4de40b4c21d7319e9d022ff36e6db7e1e8031cfec9d1a

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