Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0747c868a1b19a4…

MALICIOUS

PDF

70.2 KB Created: 2021-09-17 10:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f15ecbef42b248422479dee09a67969b SHA-1: 94f9018486efa199f906444ef0589caff2deee73 SHA-256: d0747c868a1b19a43785bd324d6712b06d4dbb5c9b537c78009337d3c03b6a2f
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://www.plan.msu.ac.th/ckfinder/userfiles/files/mujeze.pdf In PDF document text
    • https://towa-aaa.jp/userfiles/file/73989736356.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb1af48008---dojeserajawuta.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/487081827.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/2921938925.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/31549494811.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210911130735.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/81823044495.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/27459743505.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/71227902783.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e10510eb34---zalimopobad.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/nutikekuleloxisilanomo.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/pubal.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/guxufinuvawago.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/28726025642.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/81341940132.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff706bf8ca---lotapazodavolenedawerebab.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/80419048590.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/99466578538.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/16440247514.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/razaj.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/63506768429.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/63659901396.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/29359224683.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/guwofegumagerarawajova.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/64988755134.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/20179623293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=update+all+apps+in+play+storePDF 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_off0000b580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD97 10504 bytes
SHA-256: 74f6fdbfc501d495f9395cddf73fc365a0d19de34f31ec2a49d174d43026825a
font_02_sfnt_off0000e59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 14840 bytes
SHA-256: de427eac82206cf5c8617bce804f1250e7d1bec8196cbad6312d75efc8d17843

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