Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5dea78a228199f0…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 18:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5d6757aee362c411e0b1a517c7d04b8e SHA-1: a8be3994ca8696f5c0c1fadcf68275844e0e9682 SHA-256: d5dea78a228199f0e83d3ee43f5c000d45bcfedda4f577801b395657e968c5d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://philabc.ru/uplcv?utm_term=video+download+mp3+mp4 PDF link annotation
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35826113489.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/62627169952.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305ebcb299e---xamivafu.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5fb1eafa7---pexitipopazabugogokupoxo.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/popitalovunubawesowedomip.pdfIn PDF document text
    • http://flomojapan.com/upload/files/90846779369.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/72683210012.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/vaxetavavoredaroxadi.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/xokosek.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/45544097216.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210907_111516.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/bepevarexugezufen.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/12583520507.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/56441081326.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/keveliserolonawizeti.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/paduzijiwowenijagedazaf.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbe6d0f1de---63842566589.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/871755837.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/pozimepuxotajimo.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/kegabawigagalafikuwige.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/xelolanuziseboka.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/33064319774.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_off0000d378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD378 10492 bytes
SHA-256: 5a9887caf5ae3a1a2560c177dcfb86f9e62d95ad5fb08993effe91e932b669e2
font_01_sfnt_off0000eb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB51 18008 bytes
SHA-256: bad15cb2138511b7c21f456fd4327082c88329d992d6a53eb9baeca735e06b35
font_02_sfnt_off00011a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1