Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1cde16c5aef4eaf…

MALICIOUS

PDF

89.6 KB Created: 2021-07-05 05:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0488a7388d663dc8df9019177b3f9702 SHA-1: 90f351428628ed4fe4ac69b6c1b0dfeb5732e7eb SHA-256: e1cde16c5aef4eaf8c1c9e45775c6429092aac313803be8622e73c14a82cbe75
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://animalscipublisher.com/files/upfiles/file/kitabimazurefenusaze.pdf In PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160948eae5fe08---85423533888.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/psjjuelc252mq0dni12q5qoqfc/sumexikawepatomonodaf.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/visivarok.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/07b338083478f44da294335b92dcf7c8/litonobevezajagizupejale.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/dasoli.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/fewinagazuwarigeboza.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/junivemivixemaxebarularo.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3ae290ea---fugerotumunirix.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a892035e07a---75210438572.pdfIn PDF document text
    • https://digireg.nu/upload/26187171263.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/27215707678.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160b05d30857f3---74231924567.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/kukoza.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///74909803897.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c256c43c7b7---zaguzetu.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/lafifeset.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3278527e91---51124143625.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21f0580071---nopinapefoxot.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/88631449856.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada903c1339---68799115785.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/47901667416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=auditing+in+a+computerized+environment+pdfPDF 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_off0000fb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0C 10956 bytes
SHA-256: 538c160ff0048248d91b0fd0eac86c7f8f263c4b48c65c11e421a903ece61996
font_01_sfnt_off0001144c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144C 16972 bytes
SHA-256: c4f4c8afe098b0dacacd7c0b796e676974486e58907a730662c4e5db18be6bdd
font_02_sfnt_off000140b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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