Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5e48783465d1dd…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 12:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c67f4f1b01ca771c12072e65ecdf4d5d SHA-1: a7b51acdd9b5a744a0daadc34df5b4fe79f45f27 SHA-256: ce5e48783465d1dd7f3824f3721551de35148d3e10f3453ff6aeb44c98b2edd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs are structured as a link farm, suggesting an attempt to lure users to malicious or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://crysiq.ru/uplcv?utm_term=pdf+expert+annotation+tools PDF link annotation
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838db593630---velonobov.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/53a5debfb400d764ddddfe841cb94790/25000364867.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/3986722446.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/zininawaxemitupos.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/sibajizafetupel.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/zelulomuwadoperajali.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bf124adcb---44901907394.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611567ca4e971---65627047027.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/66046792526.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b18f2d69f7b---94341843385.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/28405784585.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/30479844330.pdfIn PDF document text
    • http://expresskaliski.info/file/8512228883.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/vekofoxave.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/zizoxivofuk.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/tomenedojalolimodidafon.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/dutogidu.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/48921813606.pdfIn PDF document text
    • http://abpaluso.com/upload/file/91213361359.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/65937171068.pdfIn PDF document text
    • https://viticoltura-enologia.com/file/mamefa.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/5b3df7f4e1b1cfbf24cd559a385c0648/18628370556.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/b8ca813f4c5ea50c9e383687071958d7/mukoxa.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/jotizivelevuzewigun.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/lapidesozudanosesomegemu.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_off0000dab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB4 18028 bytes
SHA-256: dba6a11c36ad11cd04842da6d71f315ddd384b63b729d535b6e99e9874b0a941
font_01_sfnt_off00010a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001224f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224F 10596 bytes
SHA-256: 52a170e5aabf698673d14fa4f122e5eda346152b26ce8bf7a7c75164fa7b579c

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