Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58310e72d4132f8…

MALICIOUS

PDF

81.9 KB Created: 2021-08-01 03:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e9c91930b0075c9c4fd61763b95492f9 SHA-1: 9234d4558387a1a1ce42d2fabd0b4d24a837499a SHA-256: a58310e72d4132f8be22550e880177916faa53e0660680c8be98f71ecc0b41b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://chcial.ru/uplcv?utm_term=esen+yay%C4%B1nlar%C4%B1+yks+tyt+matematik+soru+bankas%C4%B1+%C3%A7%C3%B6z%C3%BCmleri PDF link annotation
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/61263731671.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/33644366355.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/d8f02e7757f882af6531d99d221952c3/23090024487.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7bbbb4193---51220011020.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/2bbf8b096365e38835463559ebe5b691/buzujiteze.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/43990220789.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/0r90nc7egjb1vtnom41dpico0e/64514526625.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed45143839f---70883919035.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/5914454032.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/zadefonobijutexujewexoje.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/vupijato.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f48b89920---84372855421.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/17175484952.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/bur06kekvs5jvbr5nlja2faujd/48396750176.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/39278102724.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160f73a0b38132---vogewupilirififibobo.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/domowunewi.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/foxuz.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8550a9839---16906682577.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/59481943997.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a22cae0b96c0484d5f0da1aff9c85653/7472155364.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/bfa02cecf05938f2e050d802d12a15c5/nirozigekujitimutekob.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31e7959125---18145333980.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6cf4d0b6d---21022291037.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/88021222486.pdfIn PDF document text
    • http://tfforming.ru/d/files/37091511863.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/39609993816.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_off0000d4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BC 11408 bytes
SHA-256: b4f7cc0e63a30477da77725deb1582cbf3c951a8f62f1e461e721c1691c23702
font_01_sfnt_off0000eed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED3 18992 bytes
SHA-256: 30dffca75d973ac90b750dde135b3b8a6a82a8aaec1ddda40583bec3f2fe087d
font_02_sfnt_off00011dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.