Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9572d21146b2f1…

MALICIOUS

PDF

85.1 KB Created: 2021-08-19 16:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 899801b8b31ffd08bdceee6dfc56af2c SHA-1: f6352997804bad720cf4575b1b64fe0812a722dc SHA-256: 4e9572d21146b2f164a2df5fb015f0053d76049e15de199a89bb55a7f13cded8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The presence of 'LOLBin token sequence in document text' suggests an attempt to disguise or execute commands, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ac6967efceffc0cc2bd6272a57fdcd73/40978952474.pdf In PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e5491ad15---paluzorijanigigaxanu.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e4da94d8093---xezefuvatovapelez.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/31689406631.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/e735f00bb185d66fe95efecf111d36e7/rezejem.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/62147985163.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879835bfdfc---15221771735.pdfIn PDF document text
    • https://macronew.com/upload/files/tisatax.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/krtldujgrc0avns4tf289ofc54/6827507637.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/vutoviradokiwowoturo.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/78d118ec4c60a8faec7927d81969d1d1/91898064982.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b07552e8a7---33897395612.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd0d1ad8e1---20912607772.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/seratujivapifotajisomeki.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/f332bfca85d2b38ebc65c0fbb87e60a2/jufufuxokov.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/pegisagovukelanimo.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/xuwusoririmetanomavavak.pdfIn PDF document text
    • http://poorclarescork.ie/images/lukopetamutumurezofode.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6be434f0e---bodarajaroreti.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ecnipgcr9dh0ar7cmd35ltb1d5/70117577883.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/xozelodudipukezanewexexo.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/vanigesotatisuxo.pdfIn macro / runtime command snippet
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703322e93cc---lutugoxikanemovuvebikini.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/713bsb9pibqtrbgj1fbdu43dio/71294116064.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/44361078377.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/1d4c49e844ad4d69bef30b7c04946090/11849295782.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/xIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=jacquard+procion+dye+instructionsPDF 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_off0000e333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE333 18972 bytes
SHA-256: 706e748cf6f830956654ab2e649bd4fa02fa45ac4bdf8072af3e6cc5fbd07001
font_01_sfnt_off00011555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6C 10812 bytes
SHA-256: cc9fe7ff437cb856e12ac493ea094aa8cc91556204d6d17bb87b387eb443cccf

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