Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceef0a513e6a793b…

MALICIOUS

PDF

84.2 KB Created: 2021-09-17 15:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70da6b4a4773b62be214c7e63bb8365f SHA-1: b547c50d9d62c695c93cda9c1c59ffb600dfddb4 SHA-256: ceef0a513e6a793ba76cfb6d53f70f45fa4f20f22cf0534d2f0719c543520b33
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document likely instructs the user to install or connect with a remote-support tool, a common tactic for social engineering. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it may exploit vulnerabilities or lead to further malicious content, hence the inclusion of JavaScript as a potential execution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • 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://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/3957eb7a76b41dc271137a06165e3c43/30853700438.pdf
    • http://blackivy.pl/userfiles/file/kakoxekuluvefuvojo.pdf
    • http://ballarioarchitetti.eu/userfiles/files/kelokamezexo.pdf
    • http://landroverbh.com/ckfinder/userfiles/files/kasajesamu.pdf
    • https://stop-remont.ru/ckfinder/userfiles/files/dazinesatutazurovuzukem.pdf
    • http://dailymaydemtien.com/userfiles/files/82842365356.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa7a7dc43a---nemukagurukuporit.pdf
    • https://408of53crownstreet.com/assets/media/files/pupugularudupomofofogimun.pdf
    • https://sistemagestiondpr.co/userfiles/file/52274445698.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612edfda1273d---5660381596.pdf
    • http://citescolairedeledit.com/include/file/19753990568.pdf
    • http://www.drivingschool-brno.cz/files/files/baxufofotinejogibeketak.pdf
    • http://bnblspecialities.com/userfiles/files/xevulofebikegivenatajijew.pdf
    • http://twinmd.ru/userfiles/file/70283642796.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea53ad5625---baxisevafezenajod.pdf
    • http://coachhouse.info/assets/file/ramuzomibawibemoziribamag.pdf
    • https://glaskunstcentrum.nl/images/file/nidunutufumoxor.pdf
    • http://naphotelbangkok.com/userfiles/files/16195635297.pdf
    • https://bitree.com/ckfinder/userfiles/files/riminaruvesopi.pdf
    • https://portalkucharski.pl/app/webroot/media/files/vubepigikovi.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/99nmmnmpdb5caj3lu0hpjtkrme/dugezutixopazadexipojavuf.pdf
    • http://houselandia.ru/files/81645345859.pdf
    • https://innotek.vn/uploads/news_file/1425418249.pdf
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/somakurixuwilejegudu.pdf
    • http://abwnickersonplaza.com/uploads/files/1478441672.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=android+tv+remote+key+mapping
    • 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_off0000e546.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE546 16792 bytes
font_01_sfnt_off0000fd5d.bin
2f56a20bd1deb2c495366263992209d1e98369376695191f91fadeac768c5ac6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5D 10772 bytes
font_02_sfnt_off000115f7.bin
b2ab25e0dced6f849f74da35370be87f48d5c7c2864300c30bc3c933bdde8a51
pdf-font-stream PDF embedded font (sfnt) at offset 0x115F7 17300 bytes