Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9c2083cb923577…

MALICIOUS

PDF

100.9 KB Created: 2021-09-23 05:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fc630577f8d56fcfffd8c72a5bcc189 SHA-1: d66b567f6941d5706ed7b20bb9a02886713c73e6 SHA-256: 9a9c2083cb9235772c5f58126238ba4f7ae867deea3696fead005b74858b8b40
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories, suggesting it's designed to trick users into downloading malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a visual download button further supports a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://archism.ru/uplcv?utm_term=call+me+by+your+name+ebook+free+download
    • https://brahmagnanam.org/fck_uploads/file/23829847291.pdf
    • https://omprintandpack.com/userfiles/file/vojemevepavakivupeto.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/6cbd4441afec4f0d4ac928cf1e7f236c/dirofer.pdf
    • http://musicfriend.vn/public/default/ckeditor/files/joluxagifomuwatedejomaj.pdf
    • https://nasikampung.info/contents/files/rexaxotefogav.pdf
    • http://myappartement.de/web/editor/files/63868482234.pdf
    • http://onnetsolution.in/userfiles/file/jirunaxiz.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b52eb7ef31---bulodigetejo.pdf
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/28311780199.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613419a4476f3---93347942861.pdf
    • http://apartmany.cucoriedka.sk/data/files/39803149522.pdf
    • https://ilonew.tasksplan.com/userfiles/files/91023913476.pdf
    • https://vatlieutaphu.com/upload/files/ribozefab.pdf
    • https://francoisdaulte.com/ckfinder/userfiles/files/74034127918.pdf
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/zinomumuduzu.pdf
    • http://naturalwonders.com/uploads/files/77077592139.pdf
    • https://lamaisonducoeur.ca/upload/editor/file/20876376296.pdf
    • http://tuecpa.com/file_media/file_image/file/bepajakuforukomalob.pdf
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/64427094964.pdf
    • http://ohmamakitchen.com/uploads/files/pufarare.pdf
    • https://toocapen.com/files/35342240358.pdf
    • https://venusnvs.com/userfiles/file/77509409361.pdf
    • http://techscreening.com/userfiles/files/sosexivisapaverov.pdf
    • https://foodthings.us/userfiles/file/64680217746.pdf
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/xikazitipukasofokezedogo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000125e6.bin
d1feed959442af414e22fc51c0f5a1773f6f64f6b3cdc99e4c38ef1e30d05739
pdf-font-stream PDF embedded font (sfnt) at offset 0x125E6 10720 bytes
font_01_sfnt_off00013e8b.bin
86594e4f859e29112e30a21304b0fc27a409ae44e37828d3882987a0fb247e14
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8B 18284 bytes
font_02_sfnt_off00016df5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16DF5 16792 bytes