Malicious PDF — malware analysis report

Static analysis result for SHA-256 d893f227b4926a50…

MALICIOUS

PDF

112.5 KB Created: 2021-07-01 20:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 91499074eba85b6e2abca07869fdded7 SHA-1: 2f77f8d2423449986dd7e3a92be6a0419ef04fb8 SHA-256: d893f227b4926a503bfedd2e9ab3bcee208fb7e47a97fc3da140f21fe4843d25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous external URIs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of embedded URLs and the nature of the heuristics strongly suggest the file's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://synerhu.ru/uplcv?utm_term=take+out+wings+near+me PDF link annotation
    • https://bevelec.com/bevelec/dossierMois/file/55512683697.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/192259414835.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/4pugenv6mst70cnj23g1v99h91/misewagikupigasopivemudot.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/dolowigixizonibipomom.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2448f3d7674cfda33882fe3e485eed9b/nozunelexamevatorimigami.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608216c8452eb---zuzowu.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f69403bbc---jiremol.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2b2ae3582---57457299045.pdfIn PDF document text
    • http://24cvety.ru/upload/files/milizixasut.pdfIn PDF document text
    • http://webursitet.org/Files/file/17450218077.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/elp6adrcs55s7mgaip99kupug9/dibawawobifowosuxinu.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/wesaruxodetariwuwupe.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/c78e499f7d1462782f4056c47786f235/15738965658.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/pe37u82nn9h8f6ar57gv5uabb2/86310448676.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f05f095c7813977c84aff694584ab98b/37746177380.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/807feec63da646d614bd4b2139713bb7/64020198326.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/b4htrg6bt6sgjdmfbj4bdasp24/35012842621.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160712130b7843---perepezusog.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/71d2fdaa4b1507031f45a902212023a6/bafarufubuzuwisi.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074186d9ccc0---pebetatopugijipi.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b23746c82da---45163788151.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99d021a64---82920276701.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/3486d6ebe6b0a197091096f16f35efc2/12956707766.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/31753926475.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/mezevupafuwagebotuzonobo.pdfIn PDF document text
    • https://soltendance.com/stockages/files/galalutabiduzudav.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_off00015458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C6A 18340 bytes
SHA-256: 8cee1b0d286e641c975679f084635d4a13cad6ee82ac6f054f06d4b8779d7717
font_02_sfnt_off00019c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C20 10648 bytes
SHA-256: 7d95585783c647e34624b2f939040eec38868c329f41bf718490b77cc7d2ee83

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