Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8bb68c18c25382…

MALICIOUS

PDF

89.0 KB Created: 2021-09-15 00:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 346a0edeac5b5c4ca7d9b31c4015c345 SHA-1: 48dc8926db1ea7a051297d821c146fc89e014d7f SHA-256: ae8bb68c18c2538296c8e5104506b98b62aaf7018e7fec470ca36403569fd510
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS uploads indicates a potential for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=vlc+apk+for+samsung+smart+tv PDF link annotation
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161317a0cb7dfa---varawevarazi.pdfIn PDF document text
    • http://iucecb.com/files/file/mujegiketemuvuluxa.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/fowodadosuxowuzatut.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/53663591229.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/wefadibajabixevixujomobu.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ca05a2320e889219e22b9c92a2b39dc/63788003980.pdfIn PDF document text
    • http://thuaphatlaihanoi.net/uploads/files/tufupuf.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/xukipewo.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133472ec2b6d---67551694861.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/18948999275.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/37158063927.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/vobinipixewevitavexek.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25227150354.pdfIn PDF document text
    • http://etnorom.hu/pictures/kupusojiturobinesanig.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/48993799284.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/21325232587.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410e9e85adc---77308661237.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/pinore.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/piwetoririrelamaru.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/mapomizozet.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210902_075650_5357.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/798f658143fb50af0de3325ee03e7bdc/88383074825.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161402d5746f70---sinipemapuwomikoxeloren.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_off0000ef95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 20232 bytes
SHA-256: 09700554d00ae0a6588f8a2ea9a72173e0136afc3e39bd0912a05dbcf3a8c2a6
font_01_sfnt_off000124fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D12 10828 bytes
SHA-256: 3313246774fe735716d630fad7c036942766cac6f760dc05556de46950d38c33

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