Malicious PDF — malware analysis report

Static analysis result for SHA-256 29e8a3660851e536…

MALICIOUS

PDF

84.9 KB Created: 2021-08-10 10:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 77d405664c0c96cedd9e892525c5cd92 SHA-1: 13bcd6e33272737e5014289d6eba976d1341d400 SHA-256: 29e8a3660851e536b524cc479c0d4f8169660e389fc5e5435db4e85954109672
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. These links are likely used to redirect users to phishing pages or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=how+to+download+free+minecraft+skins+on+xbox+one PDF link annotation
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa02426b1ec---46521178783.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/onj9v3dl1s4pi2fgmpiik7qnc4/81456797144.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607039a361716---70292813098.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///83288322293.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb6e9eedb5---37696927570.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/kojidixubegikesir.pdfIn PDF document text
    • http://allycatering.com/userfiles/mepefunubaruduzedetufu.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/95493331737.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/buwata.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/98409f9829d074590f0cbccb385b3d3e/kikorexagenese.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/57911804853.pdfIn PDF document text
    • https://lecachet.fr/docs/files/26873120886.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d4ae48a5b---44675843193.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/20750165947.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/53384172093.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/nukupejidizujosexin.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/69565599221.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/xegurifabilelexos.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/679c8256bf0c45f055d0e92859c88501/zepagonopogegudatadawisix.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c60932cbe6---90986843904.pdfIn PDF document text
    • https://aokman-drive.com/d/files/93921889555.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075431fdb3f3---tudovakobodo.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/99547330012.pdfIn PDF document text
    • http://hawkins-kearney.com/clients/f/fa/fa1934e8f236f3272fb98c88546bd003/File/88583234589.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_off0000e8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AB 11048 bytes
SHA-256: f5c83720edec142d7ee97a09789c504f4c798091f88798bd3aa13dcd166bee99
font_01_sfnt_off00010263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10263 16536 bytes
SHA-256: 6f876548a45f7b4e7c2a84c218fa77f7b2def263594d393b402db91a897f3ef2
font_02_sfnt_off00012d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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