Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad08ccfaeef4fcf4…

MALICIOUS

PDF

68.2 KB Created: 2021-09-26 00:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 101782c9066384afce6245ad16954283 SHA-1: 3fb183f11cda9e79920a129dc8784a4866071202 SHA-256: ad08ccfaeef4fcf4f0ce690b547e7d1c845603dd1a74d54816e48a156cdfd441
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs pointing to potentially compromised websites, likely intended to lure users into downloading further malicious content or phishing for credentials. The presence of multiple links on disposable or compromised hosting reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d4f3601f11---vesaforagexumogutosifev.pdf
    • http://musicfriend.vn/public/default/ckeditor/files/xupesule.pdf
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/79720824501.pdf
    • http://unleadedcoffee.cz/soubory/sedogejosewomiweza.pdf
    • http://6nergy.fr/6nergy/sites/default/user/file/66220790899.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/dc87fb426fc3d63ce7361f19c3a244a5/kotefufazisuguvusaxoril.pdf
    • http://jumpstart.mobi/ckfinder/userfiles/files/73505157122.pdf
    • http://thepokewave.com/uploads/files/lumabuzaxaruv.pdf
    • http://3qlohas.com/CKEdit/upload/files/ruwabomugudozulo.pdf
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/lumawuvideporapasexu.pdf
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/95441843810.pdf
    • http://alles-vom-schreiner.de/userfiles/file/87290901351.pdf
    • http://abwingsmd.com/uploads/files/75723803429.pdf
    • http://kozhencherrymtc.org/userfiles/file/kuredoriforugitomaw.pdf
    • https://viettrungson.com/media/Files/sanegivi.pdf
    • https://kcharp.com/ckfinder/userfiles/files/23810458648.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8fe870cb---benuwurajejuzej.pdf
    • http://nanobubblevietnam.com/uploads/userfiles/file/mokuvevuwasakowox.pdf
    • http://japan-railpass.info/images/blog/file/90695952402.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/682a3afe0373c482a1fbbc36e0956f41/piledajifugadojavabonaro.pdf
    • https://llbyggodesign.se/UserFiles/files/riruxolusobawurexapazatuk.pdf
    • https://sklepbonus.pl/userfiles/file/48738203826.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=jpeg+to+pds
    • 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_off0000b092.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB092 16792 bytes
font_01_sfnt_off0000c8a4.bin
12ffdf0fc151aadeaaae8a10eab377398e5a43b5dfacbfd45734c4c3fb774f6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A4 14536 bytes
font_02_sfnt_off0000ed3e.bin
12ba8f5bf4a1bf729f80df7c26feda93f454ee0c63bb7fd25c52ff639eae87e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED3E 10056 bytes