Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce64c2e78b74175d…

MALICIOUS

PDF

88.7 KB Created: 2021-07-05 07:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 57ef2fb1f728ef172bd3bb04942b74c5 SHA-1: 7dbb686f9b9fbd4f9d4b5fb89bd89e5a90d200b5 SHA-256: ce64c2e78b74175db7f06fba10b807d63043fed957eeb76a328e9902a5e311ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The presence of link farm heuristics and UTM parameters suggests an attempt to obscure the final destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://allytemp.ru/uplcv?utm_term=tony+bennett+the+birth+of+the+museum+pdf PDF link annotation
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821a3ca22e1---96484962581.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d81899d1ac8---majatajogidisesur.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/53325353067.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/2959581413.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210612155253.pdfIn PDF document text
    • http://capital96.com/userfiles/file/kegawipuju.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/pagudixurad.pdfIn PDF document text
    • https://ebooksweb.net/files/file/dizofuwetukajipukufitazi.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba39fc333a---20735290492.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/morozomab.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/valewepelusoful.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/tasetinevupagom.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/75181321401.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021061718311942.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c7afcab2daf---14373247511.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22c575bb3c---webegekule.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/jajenawabolisiwawojaroriz.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b8ebcac28---zokiruvotubuko.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/xiwesokigaseref.pdfIn PDF document text
    • https://medtek.vn/storage/file/zovedesugezufupefi.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/47402281968.pdfIn PDF document text
    • https://pellevah.com/upload/files/siganerubisopifirifogel.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073100472edf---50265624346.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021061709442470554.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/57304997691.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/5k13659dkacljdhvj0ept9rch5/55380139485.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/lokuwufalepup.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_off0000f619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2B 17700 bytes
SHA-256: 6a186ccd9b627328e1f704e71d167176687c52ae731b39ef069fe77a971e6b9b
font_02_sfnt_off00013c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C40 10872 bytes
SHA-256: a67b5d040cae19c78b4266cc0024a776691c6d8d1b888b0199d95aff0351ae2d

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