Malicious PDF — malware analysis report

Static analysis result for SHA-256 717016352457a4f5…

MALICIOUS

PDF

86.6 KB Created: 2021-09-07 11:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a780257813236aa9de15c8191b0a77f7 SHA-1: 265074bfec47996600eec5be70faca22d146054a SHA-256: 717016352457a4f531cbaadc7db0f8bf0003a23ad1680c3dd2725ffc3e7a05a1
156 Risk Score

Malware Insights

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

The file is a PDF that exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to WordPress upload directories suggests a common technique for hosting malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://inezorviskids.com/clients/37546/File/nisotavigovigekuloxaseb.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/99259827330.pdfIn PDF document text
    • http://espicycooking.com/files/file///52238088162.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/c3f683376bc1254a47d15e384aec7433/rimadibok.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/4828061ef9077ea735104a10b2fed2ae/54979058205.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb02a8c53f---tidanedovosovuzotajefiwis.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/68368980692.pdfIn PDF document text
    • http://drironcat.com/images/file/fifizopiwopedobuku.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/mozoju.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/4abb87372f8bea6ba4221896a1e3630d/46263404232.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/98227267884.pdfIn PDF document text
    • https://photojet.net/userfiles/file/15533470715.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/78cb5bab66bf3e14915b8258e62c698e/23260511413.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/69592094869.pdfIn PDF document text
    • http://hoctienganh123.net/upload/files/rapipadipagilemak.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/7135e60fa86017f6b6e23b694f13fe52/vowoziraruv.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/96794820140.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dcdf2b866---95990951616.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/zegifutu.pdfIn PDF document text
    • http://yuli-china.ru/d/files/galeritewisiwufomopolebal.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/dirodilujoxep.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/meler.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2f4b1875b---barazijizeg.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/80294596015.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/70328283266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=baby+booties+sewing+pattern+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_off0000eba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA8 18496 bytes
SHA-256: b42e0b882305bb265781ddf2da2f04509af47b2d06f368f62d0c6a55745a2649
font_01_sfnt_off00011b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B85 11020 bytes
SHA-256: 1375cd95b4b73fe92cf091e893357bd46b6ee0948f2921ad3d6bd38b6a0d6248
font_02_sfnt_off00013506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1