Malicious PDF — malware analysis report

Static analysis result for SHA-256 3350ae76940e629a…

MALICIOUS

PDF

75.8 KB Created: 2021-09-19 10:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0dc57b0c910da8b5eac4a34f14c0ed08 SHA-1: d546eec1211d376d60f4b90820e88a2350ce343d SHA-256: 3350ae76940e629ae59016b26b48a9262bf6ad69171eb7d394a8c3e1efb4798a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns are consistent with a malicious PDF used to lure victims to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crewmak.ru/uplcv?utm_term=snaptube+apk+download+old+version+pc PDF link annotation
    • https://ccichn.vn/data/upload/file/39205440958.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/xozidevewoxem.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/zejusanodize.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/vaxaladatitaniwinebod.pdfIn PDF document text
    • https://tpk-m.ru/files/file/xidewo.pdfIn PDF document text
    • http://darstin.com/userfiles/files/15302870923.pdfIn PDF document text
    • http://teplospectr.ru/images/files/remujolamuvovilumejokaja.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/rijaxelirowepapuwi.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16144c39686e2c---65475767101.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/96590800574.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/69664169020.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161408fd499160---xofawodozaf.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/11853429476.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161416295926df---zeratos.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/lifig.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/forolexusuter.pdfIn PDF document text
    • http://secoinblock.com/upload/files/14232297245.pdfIn PDF document text
    • http://polipack.ru/content/file/wobutezovejedetidepomel.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/fiviv.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/24238800687.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b41b7b888f---giforezosiretimivi.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/54567895996.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/36960066776.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_off0000c2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F8 11068 bytes
SHA-256: 39be256573b2c7279eb9d39383e3a0f6324b8b24a68d3b652416ffc6ee732a49
font_01_sfnt_off0000dcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB3 17484 bytes
SHA-256: 69dd1b4aa5dfebc7bca0b1456ce003f6e78428dd5cef424222073598e8cae08b
font_02_sfnt_off000109fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1