Malicious PDF — malware analysis report

Static analysis result for SHA-256 53cd98eab9959a83…

MALICIOUS

PDF

71.1 KB Created: 2021-09-26 03:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 11cd0f39ccc9dc401806d99bca1927b2 SHA-1: dcec48069350b899e8df212e43d60d00e2139e9f SHA-256: 53cd98eab9959a83549b166254726491fe8e5d9faf01a633c88b3e1685c79eb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised websites or disposable hosting, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the overall structure point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://medvor.ru/uplcv?utm_term=teardown+free+download+android PDF link annotation
    • http://canadianrockies.info/files/file/51950939955.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/16460760417.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/vowagovereseterexeze.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/wubamuzivipegumipamenuv.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/cbc67c1f80374c7fa867f16c119aa071/50317562763.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/nosufagubol.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/36887173118.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/fhvk9v55tsea7hfmp2j6hl20j0/dakugap.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/todeki.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/55202636449.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/xirotarupilusizu.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/63938103983.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614ebad2e6713---pogukabijinijipupufidi.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/rakaluroridotisowawi.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/midibopejefapawulusixire.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/90716293295.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/de3e5054cb580fb39e1ca547eefd101d/7153820269.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/15722330867.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/dutorofawapejenibobo.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/povagefirudojazetavot.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/xofudosedebex.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/nuravopokijexojokot.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/fafelerexos.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca0d9e210c---88386830077.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/wofar.pdfIn PDF document text
    • http://sinostandards.net/upload/files/petumerujaxokupamitime.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_off0000b5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F9 10128 bytes
SHA-256: c2f30147acffdcc7015d0b74598e5b6dc3e7d21fd229744e967351e104489eb8
font_01_sfnt_off0000ccaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAA 16320 bytes
SHA-256: 55570dd970b41fd865ab87880845c933e030ce071f90c89fb9eac88ab4ce3a7b
font_02_sfnt_off0000f60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1