Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1828feb8cd801d…

MALICIOUS

PDF

91.7 KB Created: 2021-09-06 15:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 281d36c70cdfa5638bd65e17328924cd SHA-1: a24e618665bcfc3e0930f86ac1335e667eb9904c SHA-256: 3a1828feb8cd801de8fa71451070813bb3546df39b9755ab2a53e988887f9dc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving directing users to potentially harmful external sites, possibly for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://drafthe.ru/uplcv?utm_term=suku+kata+terbuka+pdf PDF link annotation
    • http://www.alex-vasilkov.ru/images/wisdom/file/sufozuwoxerutagukufe.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/74c950f58b8330c3c005778e10d6fa8f/rewulonowipixifexorud.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaea06ae15---niwejerumi.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210905080059.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/sitejidupexax.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160959b11bbd47---78858180273.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/59332504582.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/sajobosuxeruxatuzako.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202108291412389648.pdfIn PDF document text
    • http://caramelitos.sk/files/kaseg.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/cq9q5cmect4pekvqm53fm1ituh/35388322721.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/57557741837.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/putak.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/zesagosuwevum.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/95088735019.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a5897c62aa4---zeromixemidemugav.pdfIn PDF document text
    • http://labotinnghia.com/img/files/44624926274.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/jowum.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160767d3d828e5---89117463962.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/hkrbm9o99eml7nj7kepnbgll1j/vadesuwuvupej.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/44ebbe6f28a39f9e1e8b210594e56771/kidusaledekomaxemidomemi.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/82975252769.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e61671664e---72572490471.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/12981503712.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd08aec6be---zisulovod.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e57c2fa8e82---pefavolazafimetaz.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/pupetuxazisobivixa.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_off0000ff4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4A 10368 bytes
SHA-256: 2efaec313874f6388b3ff8d5dbaa36a1e874d5ad22d6ca871759fe52bb90382e
font_01_sfnt_off000116ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AB 19600 bytes
SHA-256: 45430b14914e3e57facb0e45a89083250eec7912021d00788a0d922342255bb1
font_02_sfnt_off0001493a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1493A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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