Malicious PDF — malware analysis report

Static analysis result for SHA-256 c631d6faeff703d0…

MALICIOUS

PDF

83.1 KB Created: 2021-07-05 00:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 777f75afddc05ac8c1d089fae4b3614c SHA-1: 7c0087c36f1e97f96ce7d3ed3291fdbb1291e4c3 SHA-256: c631d6faeff703d086e9cf41e8cdca165d129711782d40d5eca0ed8893f9b147
164 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The presence of a 'download button' lure and the URL containing 'plague+inc+full+game+download+android' suggest a phishing or malware distribution tactic disguised as a game download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • 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://garglob.ru/uplcv?utm_term=plague+inc+full+game+download+android PDF link annotation
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16fb050293---begofetajepedegojoje.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/77078235136.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3253a9067---61301789919.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/76741575842.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/nafexusuwu.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16085412436030---99911069689.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a18735352b4---82914997091.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/sewirovupakigi.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/derezilirifarapokira.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d90277d2fc---gujotudolomuxibev.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607194a8c5c25---28559805862.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0134ea77c2---buturaparatakumap.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/davezoninubujowu.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/3797616901.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/gakakaga.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/t1cvnuj3c13m96cpfdoa0e17a7/rasokolisaxida.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/98028068612.pdfIn PDF document text
    • https://people11people.gr/uploads/File/41566753350.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/wamobapu.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ccf4a4f52---nazifomuxurefalogem.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/7476770400.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/40597400269.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_off0000debb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBB 17624 bytes
SHA-256: 404131bcb0f31ff613ff7f7f2867139694ba2c82c968dfa046c9d2b1ad67bba3
font_01_sfnt_off00010ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE2 10740 bytes
SHA-256: dd8981b1603b7b6418f1ad9b97bb5eae0e4856e371918b0ace71dd46badc1554
font_02_sfnt_off00012562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12562 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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