Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a77ea964c57a24…

MALICIOUS

PDF

79.4 KB Created: 2021-08-28 20:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7039d086b841a90bf3ceff80c358602f SHA-1: 11c93585f1533abb71b40cc6aa14003d0297764f SHA-256: e1a77ea964c57a243709d184101f48e8655523bae922e13811b6c0b4e1c457df
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091ca554a17b---72238082124.pdf In PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2bc6132da---56273494819.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/wuvekidikojuwijozijesapov.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/41926963105.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/tikudux.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/94fe08be1006923dbf1def22296d2c93/zepesaxojutevanazif.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba14cc977bd---raxifurodo.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/53579847878.pdfIn PDF document text
    • http://rld-carbon.ru/file/saxunemimukifiluzona.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/bazowejajano.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/lexevaduwagaxu.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/65693198117.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850da7569d1---jovidu.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5150033dfccb7e1f2e72743ef9c65807/76255877754.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160d91891189a0---danilijuj.pdfIn PDF document text
    • https://mmszke.hu/files/file/boxodizenudexawenabul.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160940b789fb65---83652045619.pdfIn PDF document text
    • https://maviet.vn/upload/files/benarofudofurirofo.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/remug.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/rejufibubopap.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/nosinijawagajesovigixe.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/25016264662.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/laduwenixejugipoziwir.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/43891868429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=free+pdf+from+scannerPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/dc48eaf4fe5d448f88e0edb6742be037/xiwokuzedezuto.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_off0000d5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B8 16164 bytes
SHA-256: 0e15436f9f0ff7a2fb2cc6b6bc8cf36e0b0d232a1c4c724ad65076ab3bcc4b93
font_01_sfnt_off0000ff92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF92 10524 bytes
SHA-256: 4c296fa88aff5a57a485d9570f3e065e7b4672b8b3df3d0ce0843eac7dbc456c
font_02_sfnt_off00011777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1