Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc30304336c76931…

MALICIOUS

PDF

135.7 KB Created: 2021-09-10 04:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0d8f14faf6f5d32669902bd1374527df SHA-1: f633712d1e7f54872163df9604422f874876e050 SHA-256: cc30304336c7693167b4eda1269af8b16e94ccc9d2f91e58d7dbcc5a27e5a973
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://bongkartuantakur.com/contents/files/kepej.pdf In PDF document text
    • https://alice-immo.com/userfiles/file/61661393921.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/44283427650.pdfIn PDF document text
    • http://islandpointfl.com/userimages/gobepawatubazulixavopi.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/zuremi.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/70840716663.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa7d719cc2---96069682072.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f01f8b601f---44299373290.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/03/dutupedekebe.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/sepuxewebelorixuvubisitob.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/5930079590.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/kuguzufuwegorezilorat.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/migaserojevewelejujare.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/45337642833.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/67778543202.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/mebuluxafe.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/2d4b125a042e490bbc1a2ea66b2599d6/jeloxejegimenovaxamezeduf.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/6496417344.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/witagivukobekufos.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/79562554200.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/21131651724.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/18134574729.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/tekagijixirufi.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/daxasefaxuxebemudaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=nba+2k20+token+locker+codesPDF 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_off0001ae9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE9B 10720 bytes
SHA-256: b2be362da3858933f7019f176b8f2abd393d2773aaa24f24cc125786e815527f
font_01_sfnt_off0001c77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C77E 18744 bytes
SHA-256: 6ba38ca2cb226047d2e2227b9f332bca94a4eadaa22c0cc68de43db392bc9de4
font_02_sfnt_off0001f8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F8C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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