Malicious PDF — malware analysis report

Static analysis result for SHA-256 d189ee97cc36debf…

MALICIOUS

PDF

88.0 KB Created: 2021-09-18 01:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e66d7f5d565d1ef3d7cc49b484084d1 SHA-1: d1a078dee6b9bc039db8a06212ecd0fa9c5fb648 SHA-256: d189ee97cc36debfb8092cc49737eee0699130b7857bb5588ca47be3491029c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The file also includes a link farm pointing to numerous PDF files hosted on various domains, some of which are identified as potentially compromised WordPress uploads, suggesting an attempt to obscure the final malicious destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://motoquadro.de/userfiles/file/63782657021.pdf
    • https://kurtoglumob.com/upload/file/91473356057.pdf
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/52938479898.pdf
    • http://tcsm62.org/uploads/news/file/jokaxus.pdf
    • https://gulf-rope.com/images/bulk_images/files/33551809363.pdf
    • http://amunt.madteam.net/ckfinder/userfiles/files/ruwemoxigiwipuraxusizo.pdf
    • http://trips-in.com/ckupload/files/8902105494.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f2177e0bf---disorusujebenonunadumaza.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ce7f20ad4---6139265576.pdf
    • http://telegid.tv/userfiles/file/patararivufutawopetexaw.pdf
    • http://webursitet.org/Files/file/89827998200.pdf
    • http://inter-travel.hu/_user/file/45170751242.pdf
    • http://sallytour.com/FileData/ckfinder/files/20210904_76FC4EEDC603293B.pdf
    • http://www.scea.edu.mn/ckfinder/userfiles/files/63966429828.pdf
    • http://hk-bbc.com/upload/file/kokajawugufasinemav.pdf
    • http://dunajecbiala.pl/upload/File/revimoxufadeneb.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161317038bf4c6---wusonidaxitivenoj.pdf
    • http://jikaramen.com/uploads/files/lozomagitanopubu.pdf
    • https://kotata-zlin.cz/obr/clanky/file/naguzefunitutosonaxisefaj.pdf
    • http://hosungtour.net/FileData/ckfinder/files/20210901_1D5E8050ED98A7B2.pdf
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/63089917940.pdf
    • http://td-mg.ru/uploads/files/nisuzam.pdf
    • http://goraku-sangyo.com/userfiles/file/polodawomivetoduzesumadun.pdf
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/28128151486.pdf
    • http://polyacer-ecp.com/userfiles/files/20210909_003753.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=3+movierulz+pz
    • 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_off0000f4c4.bin
dcef8c4e6ff5fc028b8fee9c25b8ff36a4e73767eb5d0dbbce3961b6c16a62eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C4 18376 bytes
font_01_sfnt_off00012417.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12417 16792 bytes
font_02_sfnt_off00013c2e.bin
e656939d959ed646417575a531a473f6fdcdfd147847be397b2f826dff42eed8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2E 10180 bytes