Malicious PDF — malware analysis report

Static analysis result for SHA-256 78af3c6931392a3f…

MALICIOUS

PDF

77.5 KB Created: 2021-09-05 02:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a7ddbaa2b9cc04d3b9eed9dd08d7cdd5 SHA-1: d06e15cbcbf223ca4e11be023136777bedbc43ec SHA-256: 78af3c6931392a3f84b164acca38e83aacb4d58952b7a3934f1eda93ba2b3941
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains embedded JavaScript and numerous links pointing to compromised WordPress sites, suggesting it's used to redirect users to malicious content. The presence of JavaScript indicates an attempt to exploit vulnerabilities or deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ab76ade21---16031492639.pdf In PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b33aa9482d2b4b3bacab2d6664801aae/99766305673.pdfIn PDF document text
    • https://maintogelonline2.org/contents//files/55180882117.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161219358ead2b---zufedejuvejufawezaxe.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/4b9beaf140ba8ae3efbe59bbe89ac6a9/86415524592.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/lulefa.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/fajesulesufonabi.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/kowab.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/nazigumurokefuwutu.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/rivepubafikodu.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/saxunajerumabenilupenuz.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/18909418196.pdfIn PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/dukive.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/ecfe621d6fd5eedacf0783ce4a552e98/vixinifujemilujadokata.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/20370776347.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5ed272b6c0---67379068533.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/11821736903.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/zenetidewu.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/95694855365.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/44319708518.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/40209671691.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a783c9c212c---gunebazanaberamop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=online+word+to+pdf+converter+ilovepdfPDF 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_off0000cb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4B 17672 bytes
SHA-256: 35a23a9cd3a9dff03f2404849f39bfbb1d80be8d69878b75057800a5847567b1
font_01_sfnt_off0000f85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11075 10460 bytes
SHA-256: 98eef39c8f0150d1accc0a2924fd16e6261ac5f0238761d353562dc9251f7c08

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