Malicious PDF — malware analysis report

Static analysis result for SHA-256 b14e572eb8bc520f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-24 11:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e9e727c01cdcd0426e21f1fc14b24ecd SHA-1: 66e90601acf8094ab8209951fb198a45a1bff12a SHA-256: b14e572eb8bc520f2ded04115ac91a2b42559133d1c5a5c5a01ac51182781ad6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/j6pi1rcl7fj4qog6cig2e11rrv/xelajokivezotixoxere.pdf, are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cafemocion.com/userfiles/file/lavovozonafazubepegenigu.pdf In PDF document text
    • http://dobre-jaja.com/Upload/file/gipegefenixekej.pdfIn PDF document text
    • http://espokebar.com/uploads/files/dedova.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/toxomo.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ridaximebimesajoje.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466dc72d19b---67821277041.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7abac020a---jijinulegifevewazivaze.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/62879028278.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/79702774070.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/89862728862.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/j6pi1rcl7fj4qog6cig2e11rrv/xelajokivezotixoxere.pdfIn PDF document text
    • http://zuche0551.com/upload/file/25402844476.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/9eeoodr9mmpacc98fndlgbqs58/96980760766.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/gesexotubotilegali.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/gerunepujejunezin.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cbda3b1a72---mewuxejodejogoz.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/28709960454.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/pomokatexapagenopabi.pdfIn PDF document text
    • https://priscar.com/documents/files/22945685419.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/2439171302.pdfIn PDF document text
    • http://www.depomatrial.com/file/81194514418.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/masomubugudefojoluvukidi.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/86724624448.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/teguzebutizutitev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=adblock+cell+phonePDF 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_off0000ddfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFE 10204 bytes
SHA-256: 3dae2b1146851147be756408845050f2e11810a045b64099c6a56553c92e0cc6
font_01_sfnt_off0000f480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF480 18072 bytes
SHA-256: 1d6c966678493537f58dfb764f1d2ecb28b07c4e2f62c7c73acc609fefb9e340
font_02_sfnt_off000123b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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