Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3ae8e7fa04d0b8…

MALICIOUS

PDF

76.2 KB Created: 2021-09-07 18:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d26869091b3a10028554dc3a920f9de7 SHA-1: a4dd1912390fdb1af6c42fe66d871d8d00726887 SHA-256: da3ae8e7fa04d0b8c7524f443c4d73e8bad71d50e41a93daedc6385dbe312e30
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are identified as compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware. No scripts were extracted, but the structure and URL findings suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://agroadvanced.com/app/webroot/newsletters/editor/files/vikuruvobaxisudilijozofam.pdf In PDF document text
    • https://people11people.gr/uploads/File/lifixazovogi.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/35634644637.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/vuburomivojib.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160841106ac839---14681953959.pdfIn PDF document text
    • https://jagominum.com/contents/files/jaxuwotuwunevafus.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/6065884908.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a50a9b010e---xuwumebibinoritetujat.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/9e59e2752095ed6dea5aecea4e13c2d9/vadobedinijozigavefuzazi.pdfIn PDF document text
    • https://luminex.pl/upload/file/54565407380.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/xefikobiwepawixawiwef.pdfIn PDF document text
    • https://duvanco.be/docs/files/mosaketewuwogewiz.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16114738e09232---42219030718.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/xifogunatojo.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/79628829759.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/ganodasojulibafujosubi.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/75281268338.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/0de126476051c8db356bc635a54c14ed/sanizagatinonibuvidasokis.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826d1172d5d---dusasogog.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/jegefolupixewirefo.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608f328b05948---forezanukikafujabokovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=alif+ba+ta+tracing+worksheetPDF 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_off0000bd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD99 10912 bytes
SHA-256: e940cb9417bf40846305ff36010664f85c649c6df8fe6bb5b80e00df5c2f4f0c
font_01_sfnt_off0000d6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6ED 20248 bytes
SHA-256: 4255159b45a98e6a3f47f43ffad76cdb1321a999679e37f95451cb5507e46ced
font_02_sfnt_off00010b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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