Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a0905eb4e588668…

MALICIOUS

PDF

74.7 KB Created: 2021-09-05 11:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d7df79d69ba2036a24753c617ebfa553 SHA-1: 08d81a8fc36d82ce5bfc4f3a2c74e1f685eda227 SHA-256: 6a0905eb4e588668f82e2ac421f264026630233e70aee08abb83ce0459f07690
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress sites and others on disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://acgroupenterprise.com/userfiles/file/faruledofexidikeguj.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/pujerewunazawebozod.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c048347713a---22055419807.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/77f82dfd9aa54a2950e634df9c6caea3/fevesafegakuz.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/77829548288.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/siwalamonu.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/57130972514.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba33cb1fb3---66709453843.pdfIn PDF document text
    • https://paperland.bg/uploads/file/72015709978.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/72773743733.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-30/20210730031309280818.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/vurukutunomuwo.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/nubezosoluxanuvexosuz.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607284d83a885---zevimedewufujuziguv.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/1a4cc47a77bee54efe13ed83843aed81/semesirofixotawu.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/pavobutizod.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/suxegewibatajibuku.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/kazetagebezin.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/lunuvosewomexeg.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d06888da90---dopilukeputuxarulafidog.pdfIn PDF document text
    • https://sanidom.pl/img/file/96965602029.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ggouuuij6c6cpgkqofu7ndb9tp/xexagola.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/22431154762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cambridge+checkpoint+english+coursebook+9+pdfPDF 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_off0000bf9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B5 11596 bytes
SHA-256: a105921ed2bb7fb625f5487d6e7395cec49d658ced41460053b4f146c773a877
font_02_sfnt_off0000f2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 16252 bytes
SHA-256: aa7ea303426bc0cf32792236c7155b552323ef61a8297ec2d9639947ec0caa36

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