Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9db7d27797b88e…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 03:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd4f570d23face67bafee5ecf452d093 SHA-1: 82621dd98d2f40eb1c8056b0060bb7de27692d94 SHA-256: fa9db7d27797b88eac6d5fb40c52b2cad34b25c0399249e44e0daff799ee89c5
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains multiple heuristics indicating malicious intent, including ML classification and ClamAV detection. It features a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to distribute further malicious content. The document also includes a lure to copy/paste content into a shell, likely to execute a downloaded payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=axinterop.acropdflib.dll+free+download PDF link annotation
    • http://elanaclub.ru/userfiles/file/9165013745.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/tosuxemikudawuvorowun.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xelozobepom.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/datoja.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/99523686881.pdfIn PDF document text
    • http://hongdacable.com/d/files/86084931241.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/nedewijejaxelem.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/mideserutetabanun.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/35e061ab999b9ccfffda3bdb39fd4f7e/11511250755.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddf1027d00---91734013611.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/kuxonewuzuli.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/8751807653.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feae4ca32d---3759758005.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/9e204cbb4dbb1897586daaf82beb58df/25929482708.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/7c2efb40e36ecb69c257c03241015249/75578605889.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097358d95429---95881569063.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/ditarunonifika.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/5ba23611b857e9d26042de93cc1ad9dd/97098498781.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608129d2b3486---pizupexugekuviwatotujilov.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/62534879748.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/kiwojudatutisedabaludumer.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105f2a740469---32960688416.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0383de2002---gubexaf.pdfIn PDF document text
    • http://derma-dts.de/files/file/35635424833.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/47004846602.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/posegubojobuj.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_off0000e44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 10820 bytes
SHA-256: d06351f391bcc010b2a620e16ee60c09cfd857567ab0b23d00a024595bf2c137
font_01_sfnt_off0000fd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001154b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154B 18276 bytes
SHA-256: 5ed2a6ec2ad9fed81a93bd35aeb88c29bbe42b00855fa206cce1217d46f375cc