Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab743ca9c5cf3b3…

MALICIOUS

PDF

97.1 KB Created: 2021-07-25 06:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f24a29652ea4d822b1ebff21dfe35392 SHA-1: 6ee536649d349886373dfe8ce341cf8981bf355a SHA-256: 9ab743ca9c5cf3b35b750a531a69860d698c192559aa8efd36feefbada788bf3
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 http://alexlunacoach.com/img/editor/file/96791935651.pdf In PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ead65a6b2b---97495173853.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9bd0da6b2---lalunodumenegunigezibugod.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797f06e39a6---tinotelijiwususi.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/nexuxowudikikow.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/b1c92b67b07bac59ac7c1faa9759532c/polidurelisugogesezagatem.pdfIn PDF document text
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/82511845036.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f45af9703a---72444737298.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1g6su073rier9lbl98aamoeo44/mopetejazedisuju.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/2503830893.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/of8igv2101aq8g63916ui7mmq6/vevogusuvufavelipanik.pdfIn PDF document text
    • http://apvn.info/userfiles/file/63234605620.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac18455dbf---52024350369.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/gnk9cerp3drar0oon73td519jk/76322858607.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/togumevezawibejo.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/79449442e9e492fa9261cdc2f7c67c37/fodupaf.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/38063200196.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607eea63c0fb4---nuvenemufaderasojofuza.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/zabisuzawajigu.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/a02bk016913aik5l4edo4cos57/xurudibugaza.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/ro98jkb2g1ejchfccqv3h1oltu/vedisiga.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092581d36c2c---komiwuzamadixosax.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/sesolelov.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606da71f92174---zafiroludase.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/99453720157.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/suravoturapibewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=krause+and+becker+airless+sprayer+reviewsPDF 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_off000116b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B6 17680 bytes
SHA-256: 7a19f19be386c03b59da7dfaafb22673633dbe4cedaad4d10da5f9c6f5e6c8a9
font_01_sfnt_off00014548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14548 10876 bytes
SHA-256: 25d8af17070b53ddcb193d875298c205dc2773bc97df91ed878b947586ef267f
font_02_sfnt_off00015e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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