Malicious PDF — malware analysis report

Static analysis result for SHA-256 4227935a7dccd31e…

MALICIOUS

PDF

125.0 KB Created: 2021-07-24 19:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0e2fad8288128d91359a22aa9a78e976 SHA-1: 679be641194798db4d405c3e20898d7018592a85 SHA-256: 4227935a7dccd31e3e296e18b37ec39e8e04745bb465d6eb6b23de5a29889244
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is likely used to redirect the user to malicious websites. The PDF also functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other potentially malicious domains. The presence of invoice-related language further suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a69c35126---pukasuravu.pdf In PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095ce9b2634c---47215087038.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/lavide.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/4c25c9d68f0d5857f116ed26c4efae79/63355568304.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/77143756221.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16091ebc2b8668---6604488077.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/l7f4nftousj3vnc4pb7dso2mlg/mikafevokafawofowefevoras.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160784537c9195---totasaxiwodegetubamuwaber.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/e94a93c217145fae6641c016a838cb2c/41494941424.pdfIn PDF document text
    • http://fitviewer.biz/files/file/85038655925.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/jadepi.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/409d13e5c721503ddb640698f5f4ee20/89127526439.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf50ca9ca0d---67830011692.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/l13fbcbq602dhgf6ccsgnlovg7/zonij.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/2d2e0f7dddaed791cb66178180c7d7cc/21547093845.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/giwojezivotixemado.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ada7f21272a---sarog.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091c9127c23e---6546772585.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/vamomuzajugi.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c57ca4eae5a---wamadugategolidoxulul.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/22308852791.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/29321325948.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/71371800881.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/875f035e9c9f81fd14b552800b718db2/92337006591.pdfIn PDF document text
    • https://menu2uplus.com/images/file/xuradejabukopezadulo.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/7q3k9h8bikhjg2issede8d9nb5/wezukelikimapaxamob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=collection+agency+for+small+business+philippinesPDF 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_off0001838b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1838B 18848 bytes
SHA-256: 9f5187787dd3bd3823656efb2dbe6bbfae296baab9fcdeb2f2d55e1ae65d352b
font_01_sfnt_off0001b39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B39E 11312 bytes
SHA-256: bd624bcfecb78004e990480cdd1c09ac96dd965e544f1fc363b6f8c4b839eb88
font_02_sfnt_off0001cdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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