Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6976d21681169db…

MALICIOUS

PDF

133.7 KB Created: 2021-07-31 10:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 61a95b9ff178e501f13ce4799d6ba228 SHA-1: 8ecd9fa2f45f7a375245238582a99a7032009c8a SHA-256: d6976d21681169db2a0d398c83adfb0aee3f170ddfca9ff6a479e88084f587f5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the structure of the PDF aligns with techniques used to host and distribute malware or phishing lures. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 5

  • 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.
  • 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://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1cf8845d7---bapunonuzelexeja.pdf In PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/e9af51a2185a2b1cf2cce6aa82cbf2fa/41252734518.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/2390a202c5d000b0d7825a4b63881fe4/kezuk.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/zifupumeberawuro.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/nogafojovupagaz.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/walodifagefuwiz.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///82762865975.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/20954485390.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/126910cb8a84e5446b403dbcdfe6e649/kojukopavixuxepofezajo.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/42cf5addcee65a226a02d58121d01099/fewujowuwumavipejikisuwa.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/27685071835.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/35489237391.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/kowobemoniparomawunex.pdfIn PDF document text
    • https://asi-filter.pl/files/file/zopobanibegew.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609d23a360e0e---32805243982.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/84912537157.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/74407560694.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b5a38e6a278d77ec26a0551870194245/rujorawe.pdfIn PDF document text
    • https://prastosten.se/anvandarbilder/95/files/xorulababenene.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/wowawisugalikowira.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/kutizinafididozavex.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/ninivosowekesorisejemap.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160caf8eb6a86f---55001328721.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/6791199482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=miraculous+ladybug+new+york+special+full+episode+on+disney+plusPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000169eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169EB 20304 bytes
SHA-256: 4704634fdb2416c4be60494df5cbff6d30df0966c4643c705ec9a5df46ab8669
font_01_sfnt_off00019d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D6F 16384 bytes
SHA-256: 6bc4420bbfa61156f096b6f0725168f8601d7500e332933a6f3144c23c09a2fe
font_02_sfnt_off0001b3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001cbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBD0 11220 bytes
SHA-256: 3885afccc8c0decc008869c2178c3d8416d4dc7f7713a1f9b0f57b5a1c1caa4d
font_04_sfnt_off0001e5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E5DF 9804 bytes
SHA-256: 0cec743f4c3ab956f0d846bc76c80a90a6ca074edef788b728d32dcb5d466ed9

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