Malicious PDF — malware analysis report

Static analysis result for SHA-256 159d63d1b6f9f135…

MALICIOUS

PDF

104.2 KB Created: 2021-09-03 22:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e00c5c29d31e3bdd69b94837c7a88515 SHA-1: 9fb58ecab7d96867cd65345514096e3911628649 SHA-256: 159d63d1b6f9f13511fa81c579dec4aeb952a141e4400d1f003812b2f86f6cd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of numerous embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards the document's primary function being to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://huntic.ru/uplcv?utm_term=cambridge+english+for+engineering+pdf PDF link annotation
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/1kkodinoshpj58ojt4nk7s77p6/57636408658.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160832746b490c---jedevemisejologivowaxifa.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ead160e33---wexapojodagamogavoxi.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-08-24/images/files/mixageparuvusikabivired.pdfIn PDF document text
    • http://frchem.cn/upload/files/wimisexijaxesewefutu.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/22311671493.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/b5h6dmu047abqfcddhcemdgev7/garisuximuroratozesu.pdfIn PDF document text
    • https://campermagazine.tv/public/file/totukelisimadijik.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/kejuzobonekigilubugad.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/bfb357681adf2ac5be2e43fc47c04d87/tewutotu.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/60462408880.pdfIn PDF document text
    • http://unsersohn.ch/images/file/tituke.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b89ce26f997---80219369766.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/naxexa.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/pivevitemunamujefijevag.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/s9m82kmmoe3cjrtm1qaq7a66q1/jepisarezus.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ce1f2d608---tewowalirokewopavelu.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c67b01a24---voxavog.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/xodebil.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/xixafatirizilu.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613052677fef9---9948305855.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/28009760eeb0d90eef1a835e23b19671/99200978321.pdfIn PDF document text
    • http://fastgood4cheap.com/clients/4890/File/4974536475.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/3314abc883edc80fcb610ea203a0689d/66722355964.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160887e3b0a55a---xavawevudafigilotaxawoxuj.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_off00012c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C55 20356 bytes
SHA-256: f90fadfb1669f77cc1431411288a1b515fa72f227c9531ecab96dbfbf254fb6b
font_01_sfnt_off000161e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161E3 11020 bytes
SHA-256: 74670c01e6b8f02c88c7c9a513b87c5cd5d6615cdcefc56c4b60d3f8ffd8fc3c
font_02_sfnt_off00017acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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