Malicious PDF — malware analysis report

Static analysis result for SHA-256 f811c5df8440ecd3…

MALICIOUS

PDF

71.8 KB Created: 2021-05-25 14:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 605fbbf2ee5abf30267ba7ff5254d0d2 SHA-1: 0b134c2a33a36d2744bdd868afb6e62dcc360d18 SHA-256: f811c5df8440ecd33f3f5f93aa8900005ae9ec4306cd8125868cb34afc4ae6f2
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file that contains numerous external URLs, many of which point to compromised WordPress sites. The presence of an embedded PDF with suspicious static findings and a high ML classifier score indicates malicious intent. The primary function appears to be redirecting users to potentially malicious content hosted on these external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • 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://synerhu.ru/uplcv?utm_term=the+crucible+overture+analysis+worksheet+answer+key PDF link annotation
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/24svap7v3kl9auq3m4c03mrdj5/fejagedokuwajusabavezokis.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/limenexajusoxisatok.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160837902da0c9---84538527584.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ea8391e96---8340616370.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/kq5idk2auoc7uoc2ba52v0aqh3/67345976830.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/4972514115.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/romididojimijorepirugolu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/2154ff5f77f435f9c4b59904ae01a98a/jikebefukorisikanowes.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608470471b355---rokevegikemasajila.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/zotojopagitanilosixadilu.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7577313b2---livadowab.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1b836cb02---vipuvew.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/58l2i23s3lgh6cu5lc1h0tapt4/6795246512.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca1311071c---mabamalov.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/f5fdda1160dab2ca4be7c748db82ca1e/84106079544.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%252Ffile/keluxakoguwelemivebim.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/8ff3c775887685e2935357b2819ef0ea/fosegad.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d330aa633---mewuro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD986 5292 bytes
SHA-256: 764620f93195f31c8168503bd2e3b9ca63c726fa968156c8e6c1de518141f091
font_01_sfnt_off0000eb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9E 11392 bytes
SHA-256: e04b895db073adbdcdd573d7d729c546fc6915a62590070a7b793c22421e82da
polyglot_child_pdf_off000116eb.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x116EB 2163 bytes
SHA-256: 5728a7d0ab274e71e3e01432c0f81a3d251c082ea679ff042ddb73e3dda4bb2e

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