Malicious PDF — malware analysis report

Static analysis result for SHA-256 c610cbebccfd269a…

MALICIOUS

PDF

71.0 KB Created: 2021-09-20 07:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 020e40416cd2acc312d4624d7e8b452b SHA-1: 94dce08a9006f6cef4b135d69efdc24fbe5f2f1b SHA-256: c610cbebccfd269a4c5e7cf1751492d4c50c8e1aa5314ab07f7437165a15681d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI and link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://philabc.ru/uplcv?utm_term=free+ram+expander+for+android PDF link annotation
    • http://farmaciafici.com/userfiles/files/zelububejuxewinovekowuvu.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab5b073b75---vorobolisuxudes.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/pazawupilesefafepatem.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/63297409121.pdfIn PDF document text
    • https://artbynela.com/uploads/file/vigesix.pdfIn PDF document text
    • http://yejida.com/userfiles/file/73456639898.pdfIn PDF document text
    • https://securincasso-online.nl/ckfinder/userfiles/files/65789295282.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/joraneliganugikigavato.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/14037030656.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/44472238118.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/2314419020.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/87668625502.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614706a94afec---tepinonoxulofugoxupakij.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16134e89a2a90b---9267879815.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1614443606bcd8---piwusukupibovafupelis.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/89434723118.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/puvugukorogogenebabona.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/0a3b0937707c8a0ac260be634dac3a23/68867788814.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/73341630764.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/moxosijobopef.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/wojoxarojitazabir.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/goguduvolagolavi.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/viladar.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/vorumuxa.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/zakoxajukusedo.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/41937f922da5ec13cd27f1def46b1484/lipugifiwed.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/nezutamufupesexifesa.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_off0000b5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF6 10428 bytes
SHA-256: 74491f339cfbaf863e50ea77392c4a62fe02976efbbb9933e94d852a20765b65
font_02_sfnt_off0000e578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE578 15964 bytes
SHA-256: 36a21269ab5de20126cf9b7675eb924ee5ca51bf9cdbd649ae3c8ca57e31a209

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