Malicious PDF — malware analysis report

Static analysis result for SHA-256 8435e8ac8a04cb21…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 14:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7fffd8f695c013c8c13355fe8b67f7c3 SHA-1: 83244c7b9463fe8a94b61561459df1ae01371368 SHA-256: 8435e8ac8a04cb21c6d7b58d4d299fff9642f3060976e8f1f56b77c62478f01e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://drafthe.ru/uplcv?utm_term=watch+spiral+online+123movies PDF link annotation
    • http://realfootball.gr/userfiles/file/jejorusaxet.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109070554251486.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130ec86172ef---vigexumojaro.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/95738497868.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/nukuvaz.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/36912100985.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/sirofakowetedos.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/32396885489.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/22392504892.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/xeberejugewamixegu.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/xilujupunorexozegasi.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/92394957953.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/33040824632.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/55148881378.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161301c7cb2de5---32368810245.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/zosigige.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/ec2ae4b904a69fc6d01df4bbe74f03f7/josexajiwowebumutusejolij.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/buluz.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/talise.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/toxupumopebijativubibelix.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/beruwatowatexawubogikemim.pdfIn PDF document text
    • http://teakdeck.pl/files/file/dobawukagi.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/lenidaz.pdfIn 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://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_off0000d7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F3 11044 bytes
SHA-256: eb97aea170fb5e97c32883921727d964a6ddbaa2be195bc198f65c009e305deb
font_01_sfnt_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B2 17844 bytes
SHA-256: a2c420458324f46377f91c8731d6b725c4073f06c16e17bd23c09e0767d48645

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