Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d9ae9c04e3561c…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 12:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8d29b4cf5358224eff80975bd3ba08e6 SHA-1: 4374d80500a9532c3986d696f35a3c5114231b87 SHA-256: 08d9ae9c04e3561cdc19003586e25ca838586cd2e3aea8c6a9834a513d201586
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a link farm suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=what+two+colors+mix+to+make+purple PDF link annotation
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/fowaga.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/39062991070.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/52443562329.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/lolaw.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/rabojefid.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed40e634e2---93700432713.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c800434bc2---pitomoworavidagunew.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/92189593162.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/66773989860.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409dfcc84de---mutisibovisepemir.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/58198365983.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a29b1bbd4557d2fafbf4903100095c0b/73351084085.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141692b630fc---44941102981.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/26289551204.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/lomeli.pdfIn PDF document text
    • https://o-dance.com/upload/files/13501751779.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/robobuzenada.pdfIn PDF document text
    • http://okudshava.ru/userfiles/file/2841035077.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/99137640217.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/21251993634.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/62782529083.pdfIn PDF document text
    • http://yuha.be/_files/file/romusoxenexilazetovime.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/38778130975.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/kexelalewidapukazib.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/dilavonela.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_off0000e0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C8 16412 bytes
SHA-256: f90c9d423a427cd6dd7099cf22a117485c5bfc8febcdcd1b26c0866f90814c2c
font_01_sfnt_off00010b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B39 10908 bytes
SHA-256: de53203c335454bf46ad3b7138e37b2ef6b495caea1455abc89ceabe58708ac5
font_02_sfnt_off00012498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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