Malicious PDF — malware analysis report

Static analysis result for SHA-256 996f0bcd428d8b9e…

MALICIOUS

PDF

82.8 KB Created: 2021-09-23 10:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5917b41dd0867efa1b49361b0f2b621a SHA-1: 0fecc9b8c6e4b0f577216aa0e727e98a7a54951b SHA-256: 996f0bcd428d8b9ec68727ec9758237e9f181bc8ae995119c63044a31e71f0eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. These links are likely intended to lure users to malicious sites, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://altadirezione-consulting.it/userfiles/files/77778897622.pdf In PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/diwovomalasofobipipijug.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109071431272567.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/16885066802.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/22247605602.pdfIn PDF document text
    • https://rn62ug59c-to8.com/contents/files/87709736597.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/26930375753.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/xurowobadesa.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/xovupekusa.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/jopijuzijutenoj.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/giputisugo.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161364f13883cd---xawasisezoxod.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1d06423e9---dilajonivivuvabumuwexut.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/eeb7211bd033406877f17ce914634e7b/lezux.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/pigosolid.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/89356058533.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/3810456002.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/57142106807.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/70867903594.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/resivuworigadu.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/8297535105.pdfIn PDF document text
    • http://samwha.com/upload/userfiles/file/lumoloz.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/mumerawenibolomebi.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/15306033825.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/13288607461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=raya+and+the+last+dragon+watch+online+123moviesPDF 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_off0000dd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 11472 bytes
SHA-256: 903c89b278eae2065bbdaa406ee32b40383bcccbe633dcacf29c70dc27e4692a
font_02_sfnt_off000110a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A1 17248 bytes
SHA-256: 4dfa12abff4f3ddaf80b35c9258a1698cb854c80f0c21fcb5cdceab8cf45832b

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