Malicious PDF — malware analysis report

Static analysis result for SHA-256 babb792ea5932b09…

MALICIOUS

PDF

87.0 KB Created: 2021-06-26 05:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4d81df0c73bab628802d5e90826aa88 SHA-1: 76fbe7d2ffbd831e51ccfa3b2acee14184a75d73 SHA-256: babb792ea5932b095bc60bc2a8e97c4fc7029371f5e285a7246b241e89f00977
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://monyetjoget.com/contents//files/bajefusopibopewikije.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872a77510bd---ponudov.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae6b6631b8---51941209865.pdf
    • https://autotronics.vn/userfiles/file/71510834879.pdf
    • http://aaaexpressheating.com/userfiles/file/3350027265.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a954fb6415---14529370040.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/79f4e8b590a4919abc4d992b67d18b6e/wukolanubivedurusina.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/b00cgrtbo9udvrm7i9s6mp4pnl/68885667182.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e656542863---46574594824.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c21e5db860---kodepufesizivirinun.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/j41bqei98ojg0s860lu0flvbv4/boxavikumopinemifo.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/uoj659msc2gqnali552pfsmlde/xexeletir.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/6e6a6fcdf3f757fc2902d59e3379d438/xaritet.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/00e5fc957e2677f9fff8792c4b8559b0/238099641.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6938fb7992---pigeninos.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c139a901662---kobubogek.pdf
    • http://thermogroup.ru/uploads/files/zisoxotumizaneku.pdf
    • http://isagenixmakessense.com/ckfinder/userfiles/files/20366774789.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/snmonlhc4cghulqmmnm4tl12l0/15095618001.pdf
    • http://stasta.com/userfiles/file/gijekejelofevat.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a4b745cf2---25266589901.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ae4d5baa1---39711200041.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=introductory+and+intermediate+algebra+6th+edition+pdf
    • 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_off0000eef2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF2 16792 bytes
font_01_sfnt_off00010704.bin
df56dadf1dd43f61ba72837f9237dc99eb392114a74e1dbc6e189412c5343631
pdf-font-stream PDF embedded font (sfnt) at offset 0x10704 16832 bytes
font_02_sfnt_off000132b0.bin
40e693eb18afbf2540e28fa38f0b0382cc2fa68488f041789c5285c1caa3fa55
pdf-font-stream PDF embedded font (sfnt) at offset 0x132B0 11372 bytes