Malicious PDF — malware analysis report

Static analysis result for SHA-256 975503fe45664390…

MALICIOUS

PDF

105.2 KB Created: 2021-06-27 04:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e23f552ceb1ee6c0d9944be6b40f36e4 SHA-1: 79170cac4b17611abc36283560f1815d2cbad931 SHA-256: 975503fe4566439039ece788b0747abd47b53bcae3e27c12c72d7afeb01a10a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/bq5v8a0e1raml0r2d14rlalkln/bezevaxewufezizuvegopapup.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f14042cb2---bewadagotovemebin.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/12d1bb31ac4330745611cd8713965c7c/mupezu.pdf
    • https://next-engineering.com/userfiles/files/65684830044.pdf
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/94978382960.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609612a66bb5d---niwajedijo.pdf
    • http://champaigncursillo.com/userfiles/file/wutus.pdf
    • http://blevy.com/ckfinder/userfiles/files/9535339347.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/1620966393127.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cda1855c7---79764770367.pdf
    • http://lovesushiscv.com/uploads/files/midokoniretubowileba.pdf
    • http://aftckwt.com/uploads/file/voxokiwufasu.pdf
    • http://megat.pl/uploaded/fck_files/file/luzojizefonaxujeto.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/dn8g4sg6s3fvucleflpt2d8uu3/24814226969.pdf
    • http://pratiklinik.com/img/userfiles/files/burosasixotiwos.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/siddr90mfprv2n27fkenl4rd22/90326882756.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/56anae1na3jmo8cf9ftqm5at1g/tuwewopekev.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/l8mvacr6ltjevaahub0hq8pb20/4334905129.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c536f29f27d---kuzivaduwaxotujemedebo.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4fa02067b---12923968740.pdf
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/46235354128.pdf
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/44095547781.pdf
    • http://mbcasc.net/imgs/file/62544002449.pdf
    • http://kiuruvedenlukio.fi/tiedostot/file/99540800594.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/2366776f6ad4b8ab04bc37179d0e2ea7/totitosajid.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=human+poop+meaning
    • 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_off000136bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136BF 16792 bytes
font_01_sfnt_off00014ed6.bin
dcb63a6898f106d2de7bd1441854eba781ec5393992a088d714c747b3a6589f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED6 10276 bytes
font_02_sfnt_off000165d3.bin
f8aaa8eb9a17daca1f1139f4cc91761f65e47ee44f8e07317f9f43ccd7887254
pdf-font-stream PDF embedded font (sfnt) at offset 0x165D3 18772 bytes