Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef065829d7bd80b…

MALICIOUS

PDF

96.6 KB Created: 2021-07-02 14:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6105f5138565908f44eb080232a10cc7 SHA-1: 28791c20fd2d403429416c738bbe9ee53621c276 SHA-256: fef065829d7bd80bd85ef9962893529135d9e04dc6d4407a2cbad48d21b2d5ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute phishing content or further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 7

  • 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.
  • 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://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af180ca2ba4---58687166039.pdf In PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/fe90353d5e0f12e46f21de52dff08e61/regugamuvafimabegikekig.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/18129935008.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/98626861557.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/d06c566ce4532e79f5208d672ef22f11/33754527648.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5f04e1d73---popav.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210606145542.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609edab324156---nizokesiduxadotonanetu.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/lijogovig.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de322426a5b---jatezesedexori.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/107f64f732174d81dfe55499b5c8015c/gudolimovusuzibinadu.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160716a60b38f1---53854253615.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/vakikalakezibifepog.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb2f255c56---19542260567.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/sowezuzovazifelog.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb7694f575---99248794085.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/dubodaredep.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/6p9qko0j6016dcattcijr92cro/neziw.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/8611f1e7d86b0b9e3ca581c0a526b836/molopigezotuviw.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba67503b438---85113630873.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/9krrevjqn8psi4ervrsr35ji4g/96828635048.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/19838788068.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/fc46ece1ce9c2f1042f9608f37937b79/26036621271.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607f451281833---38450110561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=css+get+data+attributePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC5 16116 bytes
SHA-256: 74ea40c6abafff908ba0a862ebf25ee1d47d31f530ca964bdc695191fb21b084
font_01_sfnt_off0001141d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2F 18384 bytes
SHA-256: 8ef9e1bc30eae652db9e78b35a134935f1b4608ff015327e32ff3a3d7e42820d
font_03_sfnt_off00015d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D57 10424 bytes
SHA-256: e5180fb34d421f0532028eb45ab8671e4bb48d773dc5f7dc1d5fd806ad7692e9

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