Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dbf1596e75bce2b…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 20:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cc67e91d467f6f61ac6472a44a8ed1cb SHA-1: a4381b8549ba3032eaa1ec6a7d755068d729e517 SHA-256: 5dbf1596e75bce2bf004c606acae32b1c3081cccc79f2dd614b072b12ad34e83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm designed to lure users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and the overall structure point towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://yey.uw52.com/upload/files/wigizalumuzumumor.pdf In PDF document text
    • http://stroyindustry.com/userfiles/file/86575193163.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/xesexojunasulukifikazad.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/95321677312.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/zeviwusavenijuvaw.pdfIn PDF document text
    • https://bor-diing.com/upload/files/ronasuribogurewawaxadad.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/62355549240.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614045b74782c---31287130993.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/jurebadidefagutewugabimo.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135096c7d132---bitupokujawebogitofow.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/9313859493.pdfIn PDF document text
    • https://t2sc.me/userfiles/nopenurusozinaxiz.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/lirulelorenofujaraz.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/sodotidiweva.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/63051558308.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/rovoronis.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/27008907017.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/defezufafo.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///loromogijaxulisiziwi.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/zupegodi.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161432b2b64085---guwesija.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/24469380724.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/49358970984.pdfIn PDF document text
    • https://aedwea.com/upload/foto/sumil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=download+km+player+apkPDF 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_off0000d2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EE 17600 bytes
SHA-256: cd079c33839fe555ca5e113ec500a285ae924b7b3ae208e8b99796f38aea9279
font_01_sfnt_off0001004c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11863 10488 bytes
SHA-256: 90fc8aac9ac7d366edc3ad00430f6542601fec0be45c0fa5fa97b64e9a6197a4