Malicious PDF — malware analysis report

Static analysis result for SHA-256 378a20a7ec268853…

MALICIOUS

PDF

90.0 KB Created: 2021-07-03 21:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 89e51810156ddde5be2ec22003025cba SHA-1: 9d4d2fac8fe90cc67853edaadf979ec7458cc87b SHA-256: 378a20a7ec268853c0b76dbe84bf049000fd806ea9aa947538a84c76e96ca3f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting sites, suggesting it's used for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://soba05.org/wp-content/plugins/super-forms/uploads/php/files/ca83c58dc07d7eea29b7fe3c8861b520/60531453811.pdf In PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/katosowupitogib.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/25698116555.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c9f45a5f4---8870308807.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/nekokepi.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d38e9c425b---42632484393.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/c31ad58f0ad1d2940e6b13f08acfed36/zujiseranezegagowixugije.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/bd7475430de8b498f10962bf0e90522c/lezofizopovirop.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/gabewopazenofikojasamemu.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16078e862ca69f---54224045359.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bf155afac---66422200005.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/3367192277.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/29d82a90c5bf9bc5740c716d834fdc68/wifoluvewilebidosimene.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f9cae596d---pekatenobabipukad.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/rrl894k9u7fvv54o37uunoknd7/27658459612.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/28116dd06b6ade4284f66af9f3553029/89744620989.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/72175101808.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/vonig.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/wegusosigaluxesoxorab.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/455b6b49ce09cf1a38d2bf553cd569ea/58575226182.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e014a07d5---dojibuwowog.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/negazumuwukezuxuf.pdfIn PDF document text
    • http://apcmagon.com/userfiles/35529278330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=can+i+give+formula+milk+to+newbornPDF link annotation
    • 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_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 16824 bytes
SHA-256: 95b961881a417ded0f2336a8b07b25e681816f67aeb263acd983dd7a7182d6ff
font_01_sfnt_off0001298b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298B 10904 bytes
SHA-256: c09453f0f0f41710665d5d0d599f47327f8e4dada941fc1699326e526269a010
font_02_sfnt_off000142e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1