Malicious PDF — malware analysis report

Static analysis result for SHA-256 3475339d94ba8722…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 21:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 72b9477cd3ab4ea98202af9d1c9f7a92 SHA-1: 3ce6c45ae18084396472fca32d7025f25c086182 SHA-256: 3475339d94ba87220fa32484d86d9b4c36ba50737e45f1e03d7dd59985ee8276
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

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://ketchas.ru/uplcv?utm_term=how+to+delete+internal+apps+on+android PDF link annotation
    • http://alrabbancapital.com/file/files/goxaworixodomonevezit.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/5871016425.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a83056d44---22601857995.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/8200932252.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/d67ae2ae7cbddb71abc55b2c82fcdc7d/vitinabilanijikavolureniv.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/96954413240.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/e0f045d291ff82e7b3d3f39ab17a4f1a/lozixuvuru.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210915_005450.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16137a7ba03852---27875657651.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/24771833619.pdfIn PDF document text
    • https://dcimx.com/files/45654243490.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/41630232626.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/lunurotajesikogifew.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305cf41c49a---sirapigudoze.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/f50b69f6bf676e6e3bcad89835524079/95733657844.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/58455195328.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/82502692641.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/36179026162.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/48790772117.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/genoduvuxu.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613448983cefc---dutefufanaxog.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/sofavezomujewopufidufuni.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/9ab074b8b0bc041cefb9a95eb8976081/wufazewegavezagimir.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/55720810454.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_off0000d3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EF 18256 bytes
SHA-256: 3d5e0529000360684c855a0ed3402ceb9cae9e7d0b102eb00fd8d29455131ae8
font_01_sfnt_off00010350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B67 10460 bytes
SHA-256: e94c964b782fc8027242895240a3b9d6c3a97d2ab730d79501948f0eb1cc57ea

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