Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5fb7420b15bead…

MALICIOUS

PDF

87.5 KB Created: 2021-06-29 02:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7d802d357de5d694e2482a26e806544e SHA-1: 4e1d1ed8cb43dcfd85065f06365d88610c57d484 SHA-256: 4e5fb7420b15bead32898fd62f4c94dc509bb0547d4b9c94e5c0cbc28f9b0f00
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a link farm pointing to compromised WordPress sites. The heuristics indicate that these links are used to host malicious PDFs, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript potentially serving as a downloader or exploit trigger.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/d4m0e63ueleccvrtcm4chvevi5/xupefitiwuguloko.pdf In PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/g0h5rs43m3kca6nsp664t31j6a/34237618251.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae20dacc805---kitexegefezekibalona.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/7e5d29c287fdc4d55024f56840edffb3/75785803756.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d1277a740---nupabemelalobodaravedu.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/90518927274.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/e1f464438da0a38e8d1867d6fe0dcf87/kosonikutavafanasuf.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9233cb1b3---jawatarijezef.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac21753c9b2---60410543415.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d552bd7f102---20832197603.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/rqtieie7mq9s14mqtega7pkpup/80531560077.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/bifaratoxabez.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/rimas.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/3831534191.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/nulavokinasogel.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/28278169579.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/90311307637.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/belovavoputuxoto.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/zesabodovelerubazowemito.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/rojopoxowixumosezifadu.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9f92c1b5c---94366547731.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/69706390404.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/9dd42b26a31b8fa3b4200ace2be3725b/86374289535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hallmark+it%27s+time+to+come+home+for+christmasPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/wapitif.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 16644 bytes
SHA-256: 713bc6af0ef48bec88c9ca876e7b831b92b2a0e3c3357c86a732e860892a04da
font_02_sfnt_off0001383a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383A 10612 bytes
SHA-256: 06c3bc716efacecb091ecee70a5da7a6b0916eea6e6f18a5977937c79883261a

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