Malicious PDF — malware analysis report

Static analysis result for SHA-256 7021d873a643a1f2…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 01:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac74fa66fde39605c70f44776ff9638a SHA-1: b594afd40ee9d6a269d9547cba34de22d9d8a63b SHA-256: 7021d873a643a1f22ef89e41556e95ca009c800c2dce7e141c6ae7495983b528
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://artbynela.com/uploads/file/nowiledizixam.pdf In PDF document text
    • https://signatureshreyas.in/userfiles/file/97988676256.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/melatebumegoz.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/kosugokivuwizodapezane.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/57736405619.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/dufovofuvesixosotusoma.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/ff3d2a9058a05271f051f62b4122b3df/22419698387.pdfIn PDF document text
    • http://schturman.ru/files/files/32773964501.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/dunizixepav.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc5f35bccb---wuzatatal.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/xefokojitiwat.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/73485703392.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/vokugepibotufatabuno.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/xajeloxexanixelowi.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/nanulepuga.pdfIn PDF document text
    • http://tulga.ru/editor/files/96451503083.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613686ffa4ea6---17287850103.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/lujepe.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/35919976554.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/43739822725.pdfIn PDF document text
    • http://parfumland.sk/upl/febujafetimera.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/42107224836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=no+escape+2015+full+movie+downloadPDF 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_off0000d624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD624 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 11240 bytes
SHA-256: 438383994fb8966f258baaeeb23880934bd6475ac5ef55c10a1ee42484ad2045
font_02_sfnt_off000108c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C3 17236 bytes
SHA-256: 4e464002438d252db9b7d63f40cf56fabe8fa00021e81cc2c5dc32e2ebc3dd11

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