Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a427d90ae7160f8…

MALICIOUS

PDF

76.2 KB Created: 2021-09-16 07:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf24963ddc8520c36e83b1de657773e5 SHA-1: ed71eaf24bd05886137c870ff0653ffa4257f55d SHA-256: 5a427d90ae7160f82541dc456529b54008869b8100bad4b71c1263958c1e4a93
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains JavaScript actions and numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to open a password-protected file, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ketchas.ru/uplcv?utm_term=undertale+undyne+simulator PDF link annotation
    • http://pscworld.eu/ckfinder/userfiles/files/vifalezokono.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/85031534755.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/57300785722.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/ravaxegoruzajudibapul.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132309fc55e7---tifomimeponoxovo.pdfIn PDF document text
    • https://polaria.cz/images/file/xosejavufamefalawugik.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/dogela.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/99652462158.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/85205101083.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ktkg3esosqrgl9r207srojmpfv/giwotaxirika.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/10841572324.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/96417699762.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16142a86657a42---ragolesoledowujifulinixog.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dubisanojabuwa.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9c8084d99---nusamokaz.pdfIn PDF document text
    • http://rajatotogroup4.com/contents/files/xuvepazasisuxidetuxof.pdfIn PDF document text
    • https://themalc.org/files/file/pitibanofal.pdfIn PDF document text
    • http://med-os.com/user_upload/file/99439641759.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/97500828626.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/ganagulosegulevilowawan.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/fopigavavudo.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/27519521318.pdfIn PDF document text
    • https://highrise.pl/file/wimofixozinewin.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/63606695799.pdfIn PDF document text
    • http://cichanski.com/Upload/file/97273473458.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_off0000c6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B9 17088 bytes
SHA-256: e02ff510a18e4eb245817ccd6aee6246e571ce4e01d18a0c2aee28c7c63417f7
font_01_sfnt_off0000f2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 10632 bytes
SHA-256: 1759bf2a345ed336913935941944f97182dc3959d383853822a8f0be30d6bf4b
font_02_sfnt_off00010b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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