Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a64996ca9320847…

MALICIOUS

PDF

72.4 KB Created: 2021-09-07 13:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 658a2a68a07514f424a4edcea2e6ab3e SHA-1: dee3ade0464ebedec177351929439bbbf176ed20 SHA-256: 0a64996ca9320847414fe75b2ead2d9b18fc36fd591d347159bfa56704648478
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=silent+e+worksheets+4th+grade PDF link annotation
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609440fd13984---varufoxi.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaab8845b5---88832396315.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/47201284330.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/sarijekujudami.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/pefitinusefekifanez.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/205b7bc5a00542f00c56fcdd76f82e49/63917586094.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9798684a32---53648454019.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f78cfb8472---25638435675.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e24b8b1ec---96911384459.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/27022640515.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/33319747609.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6a6bc92d5---futidawizaxagive.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/99lfcc9mil8k5o0tib2fboqd23/dotir.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa04c98d6d---kakabipomuveketidubozom.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/94009384148.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/22794199088.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/54970281089.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/22407773663.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a441cdc062b---tebawowovidafu.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/48881737640.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/f6b5f2b2610645463395f80f4baf589f/laxopefut.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/bokuxijumapugenonavebir.pdfIn PDF document text
    • http://17njl.com/userfiles/files/30232254620.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/93751121535.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_off0000ba5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5A 15908 bytes
SHA-256: 5c99c13a36623bce78d03e67ce9bee76178194d5d7ce50507618634ab98cb686
font_01_sfnt_off0000e322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 10860 bytes
SHA-256: c4e63459981724f0142db7f07c7720e54e2799e5f6db1c4ffb14e217ea1a8ff9

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