Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c77932839eb993…

MALICIOUS

PDF

94.0 KB Created: 2021-08-19 07:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4938258a4ade56203edf3c8df22bf2f6 SHA-1: 9c2b3aa85bd0f6f2fc95ab2eb1a1aabec546041b SHA-256: f8c77932839eb99366e4d8c4c5938e2359c55b9e02bd1b513bcdbadc53c33a8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute malicious content. No scripts were extracted, but the presence of numerous external URIs indicates an attempt to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://247christianity.org/fckeditor/userfiles/file/ramoxamuxukukevajufif1628940738.pdf In PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160794ac79c50e---derotepoxapogesa.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/85508107461.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/nabokume.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/df095a21b2e9d4823db21a26fd11437f/delixufedizez.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/83041963126.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/federikoxe.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/ffc067aba1635c6289ea8c2b27ee1a9c/21659528327.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/r7ik68nk2b1e66ns5ab1e3kv61/12283905493.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/blm3fjbkbidhtapokis7n1uhja/24810666699.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/f00d7d6865cbf4724307da567dbf667c/22782783109.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/daxusar.pdfIn PDF document text
    • https://adikketiga.com/contents//files/83782214131.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/tezipunovifexo.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/12888409539.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/bf7d3a02a7a882f5ccbfde119f8c79d8/lasadinideja.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/tomotorosegul.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d043e6ab8---dovukepalawamutawa.pdfIn PDF document text
    • http://rykatd.com/files/19663467442.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2f1b8e5f5---90262044596.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/ladawit.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609be607cda57---kuvalabovinu.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987b1f11d53---74797370500.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/vawogevuramadon.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/2620779337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+the+7+mountain+mandatePDF 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_off00010bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EE 10508 bytes
SHA-256: e8892a9b07834b81c06e14744cae9ffe786f08fa843f23dd5425528f773baddf
font_02_sfnt_off00013bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC2 17396 bytes
SHA-256: a7069469b40ae8befe55f8e35efca49f5b8148d2329f991b5890ebcde21e5605

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