Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5eb8135eadb9fb7…

MALICIOUS

PDF

76.4 KB Created: 2021-06-10 05:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6574055880bc68bbb662186bcd04ac5e SHA-1: 6db5524ea4cff02d79b9c312ef2bd8d2d951dc07 SHA-256: d5eb8135eadb9fb73dd28d4ef7902443042bd161749029206a9cf69e3350355e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to compromised WordPress upload directories, masquerading as a 'PUBG mobile tencent gaming buddy hack'. This indicates a phishing or malware distribution attempt, likely using the embedded links to host or redirect to malicious payloads. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=pubg+mobile+tencent+gaming+buddy+hack PDF link annotation
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160707a08d4030---vogonovaxizakez.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6e20378df---74968695484.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/87716123343.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/98871175762.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/26891560159.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/17625873583.pdfIn PDF document text
    • http://artospace.com/pics/file/45385636318.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/gibogovopofejerizematet.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761fec9741c---86801001076.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075a9835bbe5---fufikutotiwuvagunowaw.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/ncrolui0r37cs0q1hht65ouvct/negubojetokevigav.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160936156e6910---tojojodafulobagalimi.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/pujekovobid.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/vuvilonepigijig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 5388 bytes
SHA-256: 9315e47dc6793a33a8c3bc34132ffdc7f74d1e74579d6ffbb9c28494df8ec802
font_01_sfnt_off0000ff63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF63 10976 bytes
SHA-256: 75a3c932dce8ee7ae97c60249a5181df9765cc33f16e49e93645be9843bfb193

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