Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67f512bc5fd56dd…

MALICIOUS

PDF

106.3 KB Created: 2021-08-30 23:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 126bb6c9e85ce61db7dc2f0ca67467d1 SHA-1: a035b250d54256693da80c971771377fc4b1ce5c SHA-256: f67f512bc5fd56dd0b3367c39e527b564ea0885dee3de4f2dad0aea35c54bf7d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c695ba5215---dopotodapokitidefonizo.pdf In PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/87186954244.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kunimeliliwu.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/26582871258.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/95730016148.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/kolejolejanet.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/91933048231.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/h2t6nmr8fnjpg8vh9sgb26unc0/gaxubesitejolisudipu.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/kizubokub.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071d277c2717---73395332077.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b329fdada79---bemevataxebuperenuvowado.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757fa1cd891---nozarimufawu.pdfIn PDF document text
    • https://network-italia.it/file/pixuwufuzanavuzugu.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/57800408354.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210620_FD4D275469082670.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/desedoxeravenejibuto.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/97947795769.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/97792142711.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/valunazuzapavobedurige.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c25955c2f---rakarorosudogu.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/62055616732.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b25c297ae0---zexute.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/3b6miitrrvvsjoqjt17rlbvu42/48105888261.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/11360885738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=island+with+large+stone+headsPDF 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_off00013369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B80 10564 bytes
SHA-256: a020cfed5ee3feaf031c01ca1413a4e139f41d4d04b61b57370756ceafdcf8fe
font_02_sfnt_off00016353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16353 21268 bytes
SHA-256: e19ebd97f1dd645107bdae422479a695f9661196643ff9ddbf30cac522e6481c