Malicious PDF — malware analysis report

Static analysis result for SHA-256 35fb4521956171a5…

MALICIOUS

PDF

89.6 KB Created: 2021-09-02 22:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: beff6619867f2e49faaa2689b244982a SHA-1: 84a9e55134df6cd6dcc98a66093a667a023181c4 SHA-256: 35fb4521956171a5b5dad9d2d7a398e4c4f7d5570d945f00b34347c0fde3ae82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly indicate malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://yfatc.com/userfiles/file/tutipizatanubapororegivu.pdf In PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac0ff44453---jesediruranisulozat.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/wojogetuzekux.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a76e4cea978---juzoximen.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/2eb2e19b7b07528a906089a4420b7f77/bifezot.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb75d9064c7---dizexigetogeralanis.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/hoht7lq6o0nj7sgcjndbb30ali/kekojujizajedumiliz.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/71536417002.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5184abdb20---febopuwomejapusuz.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/k9v34qvednve2vvlhilicbpog3/22044990779.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210716162639971248.pdfIn PDF document text
    • https://ovalpolycoats.com/media/zekuluxiwomepimugokevaku.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/68884729699.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/vidizuzok.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d53073a33c---wivafuguloki.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074fca416a87---gekitipibamomofosed.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/31711872128.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/0mjrv617jegcmoq8hu7eu37ph6/59137068112.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/a3de4a24271462202efdc9cb0f11c6cd/pufaxaniwurufokimekemevof.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/41219874893.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/q6angd973dpsp8fjhegb66k6q3/50545112906.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/9345824329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sustained+release+matrix+tablets+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 10956 bytes
SHA-256: d6157fe0fc0c46665d9951477b5775c246a7f826c9e54142cedd0eacc4ea77fd
font_01_sfnt_off0001117b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117B 17972 bytes
SHA-256: b4a1d8131ebedd3e296aca7be24f4e41098403bd16a5a0fe2b6eda725e13a340
font_02_sfnt_off000140c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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