Malicious PDF — malware analysis report

Static analysis result for SHA-256 1456370d5bb93352…

MALICIOUS

PDF

88.4 KB Created: 2021-08-19 10:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a480b2c6574531ca641206dd5ad1bcde SHA-1: 8d7aec3b474213006b1bea22b50447f50faa0c6d SHA-256: 1456370d5bb933523d19cbb356b990387c66aa78d849df858d64e3609dc15bae
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

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 https://wastran.ru/uplcv?utm_term=etica+alfonso+sanchez+vazquez+pdf PDF link annotation
    • http://cyuanmei.com/userfiles/file/tataxuxapewozedigewel.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/72301996899.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/dobogiw.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e03b9de4f---62643499830.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/wuxomuvadafezevofunem.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/30142105812.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/6a925e5ad27f6d1fe403e6f01cfdd042/61944655859.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210610024844.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5849597cd---botixezaf.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608597056187d---sebunuratanimab.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161089e00047ca---29974856250.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/jofutuwifoludakazosowuso.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/jifamutojabezunuwalezula.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/67487448168.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/61fdd65e735538ba761d240550ba8bf6/60925954698.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4f8e93301---42593316225.pdfIn PDF document text
    • http://reneenicoleevents.com/clients/865995/File/14614388326.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/30535503480.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/snmjauri5rthhslce02lablhr4/xadiv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b38fd9de8d---bunelegefafazidasanig.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/62507696060.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210626084850.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/79366be39f9caee710212010b030f3af/sidaleles.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_off0000f0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 18988 bytes
SHA-256: a1a423b4343897a6b91db3ff41fc07aef36716f347560dcb75aaf42c80428a47
font_01_sfnt_off00012003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12003 10972 bytes
SHA-256: 58442bf25951168ba3fc7f164a05f1928bf05a4599d6af0540f6f8860144ffb8
font_02_sfnt_off0001393a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1