Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a58802c8ace76ef…

MALICIOUS

PDF

92.5 KB Created: 2021-08-20 01:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 22b4709ce18fb5730446228094347945 SHA-1: 5b4507dafe88f53ffc304f5f16b5c424bc9b26e2 SHA-256: 7a58802c8ace76efd36e0b00bb0c30541da9d69d3e2b45862ce672d83ce5ee0f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites and disposable hosting, forming a link farm. These links are designed to trick users into downloading files, likely malware, by impersonating software downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • 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 http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904f09256f8---wokabatef.pdf In PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/672159597275379ed88f4d5eedab1d2d/63754282539.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/dunusipabitivamufilukikap.pdfIn PDF document text
    • https://ivanamihic.com//files/88965707885.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/11044027354.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611ed3bfe78ef---gixelesujon.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/bixelipuvavagefako.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/nebaseruraliko.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/fafe481b9bb2ea08e7651913b7cef726/79629918478.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7aaf5b00e---vawaraxaredivapunija.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/98489898300.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/mozexumaxufusikakizo.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa26353a32---48779208477.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/101fb6980080bed28c9b833284683dde/pajexiwuvimovakuribaxuj.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071db8f6289e---rawupibimasebofiminudifaz.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a36d4e6ea23---8007864308.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/kebojibakonazuxemikep.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210809211918.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/5116994568.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/9c17655a9b7481eb180d16a97d794a12/20070570015.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/pudim.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/tuwujezulinatijot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=adobe+premiere+pro+cs4+32+bit+download+with+crackPDF 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_off0000fa44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 21508 bytes
SHA-256: 48fbf06aa3aa39b70f9d7f730593bc363bf0ee24731defbd2753cd63e098bfe0
font_01_sfnt_off00013021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14838 11448 bytes
SHA-256: d01c848f2a81e78c4fbdc26b056cbf3acdc41548f54a6440f751bb3fbd99a246

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