Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed728040c9dbf663…

MALICIOUS

PDF

104.3 KB Created: 2021-09-01 08:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 439ca461d12e6ff517a1f6aeb4cc3d28 SHA-1: 728609c6d1c74d9a0562ba14790b0fcbfa6dd26e SHA-256: ed728040c9dbf66337a8da5d7c6bd7675974840d67c5fd665615c5e2c0bb332c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to download further payloads or collect credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://ipsaix.com/ckeditor/ckfinder/userfiles/files/71959416884.pdf In PDF document text
    • http://winso.tw/userfiles/file/vajigamuzirisuxamakife.pdfIn PDF document text
    • http://khocabien.com/uploads/files/fonetekixanonosozirakibu.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/zovisof.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/disunuxupewerewewiruwude.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819a72db2e1---sipozum.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/wipozenolebiwezagizoreb.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/59677061409.pdfIn PDF document text
    • https://bselink.com/userfiles/file/pizebelutifusubax.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/rujojipifaroxab.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/wegodiwajixafag.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202153155599181.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a9c784dac---12497956677.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/jijamunilamedawagukijiris.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070ba6640191---bubodufapuwir.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/vijejatomamixebilav.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16094b142d61cb---40176671736.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a67c30483c9---23630667012.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0e15cbd26---pisujibawe.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/larinebozi.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/dafetobebobizarolekubuwe.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21b871af81---99822957628.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/pavelepunus.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202108180303451991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=business+and+society+stakeholders+ethics+public+policy+14th+edition+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_off00012e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000146a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A0 18820 bytes
SHA-256: 05a6850814e4beb26f27dda5cc3c0729c1ac695443883124875a2f6086bf6a92
font_02_sfnt_off0001780b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1780B 11344 bytes
SHA-256: 1292f39f8f33240bc326a9de70afa646709b42b9df5683e4a42b73bd72f21276

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