Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2b1ae5882a007b…

MALICIOUS

PDF

95.7 KB Created: 2021-09-16 10:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 301c7b52ccb1cae95e9d9f45e9d981a7 SHA-1: de9d2e72cf89b7b0dcf18f50d9189b197dffd256 SHA-256: 7c2b1ae5882a007b3deea1af1d9a23e9dff78961933014fc09a7484c09a07362
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://megamento.com/_UploadFile/Images/file/fazakinemafu.pdf In PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/kasivopurijomagawuxuso.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/kaxopolavavik.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-15/20210915185721656253.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/50718489365.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210910062032.pdfIn PDF document text
    • http://moristas.com/userfiles/files/53973310351.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/88956298469.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b60b051f412a31951bd5d93c133ae240/norologeponuf.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/38134023127.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9df920019---97854171551.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc310b6135---10268472983.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/gobixodizudurorofube.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/gagonusaf.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/gotoxurubajexawovinivaki.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/43007645640.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/wixufimagikevodinu.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/reruguvenafik.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/powof.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210909/file/68959299288.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/bukozepugumebojenozax.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/94260881906.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a298265e2---92420795420.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/84197319119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=friends+reunion+watch+for+free+onlinePDF 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_off0001108e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108E 18456 bytes
SHA-256: 85921b6ee5d601c0ffccc182ceed434604dbef8a792198a12310d2bc2af2f8bf
font_01_sfnt_off00014032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14032 10736 bytes
SHA-256: a84d1f6c4c836dd20a47fe80c98ed92b2dc7eae649d6468383f397452d6ca55a
font_02_sfnt_off000158de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1