Malicious PDF — malware analysis report

Static analysis result for SHA-256 6163af8061552ea6…

MALICIOUS

PDF

79.5 KB Created: 2021-09-04 22:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e7a7873fa873ac87bf12d450c772072a SHA-1: 26607f40d7a4bb0dff7125c0883854f6b358357c SHA-256: 6163af8061552ea6636cd16321959cd3763cec914f6750f74642758300fad85d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, acting as a link farm to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple links to potentially compromised CMS upload directories suggests an attempt to distribute malware or phishing content. No scripts were extracted, but the overall structure and URL findings point to a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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 http://cambridgekapurthala.com/damana/userfiles/file/dujino.pdf In PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/28497406614.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaa7209537---bakigarejifiragosijage.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/kanoxezubi.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/tefipo.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f42297babd---66039962538.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/23735862719.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/atnr3lrm84fvdlck0cskhoqr56/39461283404.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/0e4f740a18691290f734c537329cd006/nunigeniwukugugixuf.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/fidavepijuburolibi.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/770403291adeade4715acec0c35830ba/mesesedojufupo.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/af5dda2532ca24a21c12bedf274af167/taposekasafer.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/mevabav.pdfIn PDF document text
    • https://digireg.cn/upload/70568878344.pdfIn PDF document text
    • http://rilta.net/userfiles/files/duwetoradirulumamo.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/1625bb6049ffb35bec1e44f079928adf/80357503061.pdfIn PDF document text
    • https://eniedu.com/data/file/20210814092937.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/0ok05khkg5g9ie3425q8ncvnv6/molanugavexaxukim.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/ritusa.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/35e33a89c09dc6f4a6dc4a8670e64e7b/tasejivixavoji.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160fa1e466fd5b---jigudezejokovo.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086199858e7c---39451999586.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160fdef1374d35---bomafusekusunuziwutara.pdfIn PDF document text
    • https://bloc-immo.com/images/97698886522.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/85839672276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=government+exam+questions+and+answers+pdfPDF 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_off0000d0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C3 11152 bytes
SHA-256: e343e49ad3e64793330748380648769690e1a560effbf06681e690bf8bf0a50f
font_01_sfnt_off0000eab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 17592 bytes
SHA-256: c543f2adade7937d902451232f39836ae67b05408f763643e4ad75f76605948a
font_02_sfnt_off00011848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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