Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5f9787a9c439c6…

MALICIOUS

PDF

70.9 KB Created: 2021-09-20 16:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 253ac584d3480840dccd023769f6eba1 SHA-1: c274e92cc2b7522c5f841046d412d7913b18420f SHA-256: 8a5f9787a9c439c650223ab6714ed30ab8081714948ec58899be6d1ca60db5dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=call+of+duty+iso+file+download+for+ppsspp+android PDF link annotation
    • https://ienter.bg/files/rafane.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/92182701670.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a6727ba9ddca00902c4d809f83bf6466/11404621092.pdfIn PDF document text
    • https://onecre.com/images/content/files/67114388412.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/jufafakizapabado.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/defawopazupisapizakisid.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/fokotepapeguzolaforumoto.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/1472604521.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/tovopimufuwuz.pdfIn PDF document text
    • http://splogservice.ru/content/files/65662097944.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/21314601509.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/e75a39b65d8605c13ed30d3f0b3bdf4c/fagudiguf.pdfIn PDF document text
    • http://hbaoge.com/upload/files/bogudikufapi.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/puturonepunaxuromesu.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/648c04a34f4627634855a6a342480cd7/82035418800.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/59464273475.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/86305374331.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/roxol.pdfIn PDF document text
    • https://petikdaun.com/contents/files/64675220502.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/zedalivawegus.pdfIn PDF document text
    • https://arbormaster.us/uploads/files/66599973020.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146d5a98e27b---81656699908.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_off0000b1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FE 10824 bytes
SHA-256: 698516cc867968cb5495fd879ef96aec2224cbc4bd3d23c8f2a21b7c8c42ad82
font_02_sfnt_off0000e331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 16436 bytes
SHA-256: 12b61e0ec7c864cca34149821d5b1551fbd7e8c02b82bf229c5660fc45300288