Malicious PDF — malware analysis report

Static analysis result for SHA-256 00b869c24037eeeb…

MALICIOUS

PDF

72.3 KB Created: 2021-06-28 22:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8e757c13a3c105d439e3dddd325facb SHA-1: 92046784adf85d0aa68bba1aacd451f0dbe02efc SHA-256: 00b869c24037eeeb2cb7dbc3481776b5821e0e600bd1f0f5e350b5c9f2b7dc17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, hosting numerous URLs pointing to PDF files on compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://st-communications.com/ckfinder/userfiles/files/rugunakojukasi.pdf
    • http://jshtextile.com/UserFiles/file///39563730960.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f11af2bb2---doxarififikajuwunakejuf.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/cf086002797da3c3f164a2b816a46186/weginu.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/lieagoncihka8dln2c2pqd3jjn/xiwovuxawadinegosinifelef.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a737e15a7f---laxarudizofivopipexateja.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69466cbed7---jakolefasozef.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/a364931244f97aac161fff73df4bc147/muxalifixafikawo.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/g45fkqjf8bh3ilf8m0kjmarnul/90744968726.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2b3ab7ae2---nonureneg.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/5d1be8a41b7597e7134b422b6cbe335e/77686371253.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f53972d280---tigasagolurabedebik.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160833fbc7f0ee---xisuxoj.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3ff5b4c0a483db8f3a8d89de8e769b13/tarevakagixumune.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608146403d8a8---birivogexegopus.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/1a493671400fa1c1df1b7132798f4d8c/40370332438.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/37539fc76f89e86f54907ff528eb0e27/digumeti.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24f38c09ef---49327482759.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/83743361362.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16093c924c6093---92383805297.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+division+of+an+integer+by+zero+is
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA77 16792 bytes
font_01_sfnt_off0000d28e.bin
574ddd06f967e544aad89a4709d1c9d43a36e7319b0467a4f47663576a658a46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD28E 10928 bytes
font_02_sfnt_off0000ebb6.bin
a670e7fe1f8661c4549174f56dd8a800ab0a0c21dd92e8bb45a825dec2a5f51a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB6 15708 bytes

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