Malicious PDF — malware analysis report

Static analysis result for SHA-256 d632e5aca8df0438…

MALICIOUS

PDF

86.5 KB Created: 2021-09-04 16:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73e0aad1b70502747c2802c9387e60dd SHA-1: c599e5f9c47a44e81aaaa4bb431b898c72903372 SHA-256: d632e5aca8df043855d2574049e1bd613b73e9a01a38d559dba00a7241ba9207
156 Risk Score

Malware Insights

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

The sample is a PDF containing a link farm pointing to compromised CMS upload directories, a common tactic for hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous unknown URLs suggests a broad campaign targeting users through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ff4506025---sitefewoxawupexase.pdf In PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/e41ftroa9fp89hn6m7mev28ole/jewavizomaxefoduva.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/vavibimadofamolamov.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/09f1f4i2ganps96h0hf4v18o54/sezinuwarepoku.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/3e4771278111e18a36e11125f0be082d/wadomemeburebubo.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/56347948187.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/81221402267.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60e6058974---64030683033.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160724e80bba02---ketoxuva.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16130d96f7f5fd---diwafuwexoma.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210703235742.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/91341533137.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/tilamizekut.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/54120031836.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/fozokitedekogekime.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/7425383471.pdfIn PDF document text
    • http://gespk.com/userfiles/file/wijevetaraniramufeziteg.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/zizebomivavazis.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/338v81i2v3gpf9t5dadddh4ao2/gunedesazemapab.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/248df7ae214acb314253f9e40aabee96/gupimuz.pdfIn PDF document text
    • https://rintrans.com/files/vivisixakebobititeruged.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/96082435400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mac+pro+2009+service+manualPDF 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_off0000e845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 11004 bytes
SHA-256: e4b3491816f8b37f21ae69218d76b15f2f80e79f4495aeda9850ad790aea8b1c
font_01_sfnt_off000101da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 19440 bytes
SHA-256: 07ec7c5fb2d86693bced009c18622e3eb3b272caf3414cece1de98028ad72f92
font_02_sfnt_off00013463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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