Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd980d9735dcce9…

MALICIOUS

PDF

86.1 KB Created: 2021-09-11 14:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5cff2367d7764ea25693ad895a16f127 SHA-1: 97a39c5f2383b993abcb06dcc18915a93bf76c2a SHA-256: afd980d9735dcce9a518d0d4c3f4729321653c6a4a06dd88b08fa54c6fa308a2
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. ClamAV detection and ML classification further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://coretry.ru/uplcv?utm_term=read+turtles+all+the+way+down+online+free+pdf
    • http://stringquartet.biz/web/images/fck/file/zulonadokewodawufegeje.pdf
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/38652215083.pdf
    • http://stphilomenaonline.org/userfiles/file/30568174792.pdf
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/2734954256.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a88208dd98---43007622387.pdf
    • https://rajaketiga.com/contents/files/matogizububok.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210909161552.pdf
    • http://banner-ever.com/ckImg/files/xonabadorixixax.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/tagojikonaxiwewik.pdf
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/bemedutuwejoralawasufe.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/fb8ba2661a83d337a758c79c0d0184e0/75866781054.pdf
    • https://ckmandarin.com/uploads/jekuzixosasajofika.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/t1ormqlcg1ifqr76r4h948svs5/45130802288.pdf
    • http://olymp-kiev.com/temp/fckeditor/file/xotiwafazizalobekakudufe.pdf
    • http://cosmoscm.com/contents/files/buxuwu.pdf
    • http://space-edge.com/upload/files/39324551695.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161394beaec47f---38074389790.pdf
    • https://weborder.cloud/userfiles/file///bobutimesatogazuloxuso.pdf
    • http://somsit.com/ckfinder/userfiles/files/54695241541.pdf
    • http://siamsankyo.com/Uploads/file/24749611416.pdf
    • https://10glazsikeyrosa.ru/file/masaxekovenore.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613522875c4c6---buxufabakadulidubojejixig.pdf
    • http://bitite.lv/media/txt/122/file/ratomer.pdf
    • http://rosg.net/sa_upload/userfiles/file/20210903070808.pdf
    • https://kaimano.it/file/36346651676.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9f5.bin
c6fd81ab6080c36dea46a46148bef907e48c067ac21b9c8b1c275bf5eb7c6628
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F5 10940 bytes
font_01_sfnt_off00010353.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 16792 bytes
font_02_sfnt_off00011b65.bin
713c7d2929cf7ae1104d9ff589652c585f7faa4d22da2a06efd71c0fd21be972
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B65 18084 bytes