Malicious PDF — malware analysis report

Static analysis result for SHA-256 08409d87ded21ca9…

MALICIOUS

PDF

93.3 KB Created: 2021-07-02 05:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 471b7b5b634e05e9512f9f1ada94e32c SHA-1: 80215125ca5b40ac1170faa2387215a7163a9566 SHA-256: 08409d87ded21ca9cddef189b5ebe7ab530ab7505bf538e8c4c1858bb725be91
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=sarcastic+meaning+in+marathi PDF link annotation
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/cckctibj05fu6lqoq67jjf3qr1/20025162417.pdfIn PDF document text
    • https://energooptima.hu/upload/File/82812468207.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/ruromozufarakumo.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/xugofafifijuvenuzetezet.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d6903ff1f---xetuxijoxejifuzal.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/29497457778.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/47857543509.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/68f1ffc7a18e3161b2d139e061e9f778/jubabedexopabiwixom.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/47135874776.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758b13f1176---mivevejolilijerupa.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b315d8da619---wixoduzulivefosug.pdfIn PDF document text
    • http://stpatricksreunion.org/clients/84553/File/sixafatelexubegake.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160dc74f826586---ledipitejixujidedakoweduv.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/8ee25972e621ac4ed284a400e3a53ece/fatagobudezut.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/xuloxumokojuwumarufusiwi.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/tizejiwuwikif.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/jnh7hq3oco3he2tk0uu2s0n7lv/5570643244.pdfIn PDF document text
    • https://naoshima-habitant.com/17205610004.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160757d2d1eae0---31550598985.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/bd357172174d1c4c318d390f698564b4/lupufelezexisikejanek.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/zozefegelolenerotelor.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/38723338741.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 18152 bytes
SHA-256: c5ee1fcdc52b9fb8b1a50590acf6b82ed2ea62a7e1055b4a517a37058a38adef
font_01_sfnt_off00011e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13697 10588 bytes
SHA-256: 92033af09b29da9e4d26ee5fea089ec426d2a5d9ffa671ca883e94c731dee12a
font_03_sfnt_off00014e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E84 17100 bytes
SHA-256: ba8c1f8e45ec5250aedc5ccb225fa1e441ae6cfc77e56a341d0e79f888fa1097

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