Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4245f32bef788d…

MALICIOUS

PDF

68.8 KB Created: 2021-09-20 03:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 47713fc7082ff4eb4cd8239068546ca7 SHA-1: 29baebc76937c3e2843f18af71cf7ba2ceb6e9a0 SHA-256: cc4245f32bef788da3a443b89447a4176f94222025953b83d69ce91fce3130e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO spam. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mkpstroitel.ru/upload/files/sotividomizivuf.pdf In PDF document text
    • https://htijsr.com/userfiles/file/selurogo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f423820a0b---nukizimixagaba.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/lofiwu.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/93220899665.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/jewexukefuzoru.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/8366538662.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/lidatitinuzalutezazirarer.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f783cdad---fepunikaxerufedevuwog.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161457c909a16e---71159652251.pdfIn PDF document text
    • http://identik.hu/editor_up/59660791509.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/62164454499.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/gawobafoz.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/63610724376.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e6abaa52a---54381192466.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/difugolubalule.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/18929228778.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/36424252742.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/0f73b7375ec826e0bd10a9c7d233fb1a/88606667669.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-16/images/files/17784103250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=my+hero+academia+season+5+episode+6+dubPDF 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_off0000adf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF2 14984 bytes
SHA-256: 73ed4f969d9dd2a89c9480b92434eb610e49d4a8eafc9b858076fd5a4198bdb3
font_01_sfnt_off0000d3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C3 11284 bytes
SHA-256: 4e792b91c622f141bc3da3c11aa919381d7af83428bf6e00db7985ece71a2f55
font_02_sfnt_off0000edea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1