Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb40cb19e3a37cd…

MALICIOUS

PDF

101.4 KB Created: 2021-07-28 06:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ff3895131b9506988a4f70fc15cbf9ac SHA-1: 466e09e005d443a1d486198f1a45e650a3e52855 SHA-256: 8fb40cb19e3a37cd4e728cd810479c66f53bd05c1c5b092aa8fe6a89ac80d08a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2ffc7ec24---66622782616.pdf In PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/491d6f0e74b78be529eec324b4377da6/4191298288.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160845d9a1592a---debixupafazukazetolaba.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ad7acbfaa---resuvawolox.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8faa4c8ef5807cda4ae3ee9c21a8b1e4/5079830918.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a78fe6144a---tutilazop.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c98aa32bc99---19661872798.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/6fbqf1rv5146si024v7chsmo6o/kulurif.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/luzewaluzama.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/86926336786.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/widenijirufemozo.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/difubovobuvig.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/7f94a07ff4e3bf175bd4dc52c52e2fb7/jizogebofurevazaror.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/43537070568.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/bj9a927imo3n5jr8o9ecqub1ma/zirivizozanugusalimunasa.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/524db0cfaaf6beb83c2e148e4a66f4ca/wejedodabapilabagidudu.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/96713270598.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/9673b1401d9b4c2755896cb179b4b652/50754717494.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/jarakoned.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/84613598468.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c305ebeda---73669948678.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/nexika.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/cf217e22fb383c236d7226c8305ecbf4/fexutide.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f30c62ff1f---81118460210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=market+mind+games+pdf+free+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000f2b8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF2B8 20992 bytes
SHA-256: 6b1a302e2d3bd81572bc4c34bcf7cb69994beee70fca6fda0c52363e58cb07c1
font_01_sfnt_off00011704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11704 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_02_sfnt_off00011f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1C 11012 bytes
SHA-256: 6d2297d269e2fe4bffa6b5bb352f885063468171bccbb37271b353050beac8e6
font_03_sfnt_off0001388b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001509d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1509D 21136 bytes
SHA-256: 9a949d806d8f250cc3a462db21014c1779903d2a427d0594a3d3f226592d1ef7

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