Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9e5bf0b324cabf…

MALICIOUS

PDF

73.1 KB Created: 2021-09-04 09:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0a9a229baa3ad5009c08f52f98c1e443 SHA-1: 38b7445f3555cfc8e40a5a30beee73f2f8c8c108 SHA-256: 3e9e5bf0b324cabff597ad2998a38434cae0037b1948440683e6e8b8e864308f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF is part of a link farm pointing to compromised websites, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, with the embedded JavaScript likely serving to download or redirect to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/0039499cacf11ff1111efb0b7d4c7a77/jafinumev.pdf In PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/82853cf6e7cc86d5ab40630b8dcef98f/160386881.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/75928966956.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/a3a97013c6f764f72f5c23b5963fb60c/10918684936.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/12203807843.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/49602591561.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/getojatuwaluzup.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16083ca0b58c32---36363548615.pdfIn PDF document text
    • http://holzbau-napetschnig.at/wapaguzan.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/19276127665.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/57906859473.pdfIn PDF document text
    • http://agama-rc.com/upload/files/99678979023.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d43b10a6ca---43495714881.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/78976108040.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/32712074095.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/4d3821921270209e0f1cfc54482f7af0/gewebab.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/43544593953.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/polinumotuvanoda.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/kilerilusafefax.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/40520512090.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/39012470506.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/tozilakajusagofutot.pdfIn PDF document text
    • http://barksdalereunions.com/clients/869108/File/fizudobexazujamolosuko.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088058560c3a---36479285105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=math+angles+worksheets+grade+6PDF 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_off0000ba55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA55 10772 bytes
SHA-256: 46cae2f952916cf9960dde50f59be55e76157fa8c694e82c569907a93f7efb74
font_01_sfnt_off0000d306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD306 17128 bytes
SHA-256: 2e63402f4652e7f76cefee12f61528395c9e387ccb418813f685e8590e5fc0b6
font_02_sfnt_off0000fea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1