Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf653bcc27fd6844…

MALICIOUS

PDF

85.9 KB Created: 2021-08-12 09:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3eeb58e424353d08ca4c3a4fd8d59ba1 SHA-1: 4a70fb24732365a353ff1a2020b3dded0078cdb5 SHA-256: cf653bcc27fd6844c7d49fff8b032ca13d4fdaa6216ed894f8915b47e47cc9c2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of numerous unknown URLs, including one using a raw IP address, further supports this. No scripts were extracted, but the document structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://schs1968.com/clients/861610/File/58849138231.pdf
    • https://sailstudy.in/ckfinder/userfiles/files/rebarifobatarejiriz.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cde8ac1e1d---26233709906.pdf
    • https://nslogisticservice.com/userfiles/files/pimovaluzimid.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160769dffd30fb---loboxifewivawuvuwogizu.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b378e2cf711---62247503598.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/9laalflv5h8tec4sb26aeoj66b/11227270448.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096468468144---nilegegulejekovewi.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082021976bbd---64356376559.pdf
    • http://lubrifianti-auto.ro/files/file/gafinigajetedagawivifane.pdf
    • https://machinex-machines.com/UserFiles/File/58512951468.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081973be75a2---kikilapiwaju.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160defc5a5b43a---980459746.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078544884736---70852959666.pdf
    • https://esperanzadeavila.com/fotos/file/8203711831.pdf
    • http://studiotecnicopetrillo.eu/userfiles/files/dejifojepejajavodadi.pdf
    • http://pattarasawat.com/ckfinder/userfiles/files/rujifekoz.pdf
    • http://conblocmanado.com/pics/file/kababiduv.pdf
    • http://vtaky.sk/media/file/jejaxepom.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7e5833363---13322583891.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9087cae78f---29750212410.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ae405958faf---54534851500.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/16431525e9523d976291d84b2e23d86f/56874632787.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=stevenson+middle+school+bell+schedule
    • 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_off0000ed45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 16792 bytes
font_01_sfnt_off00010557.bin
d143764a19c3b3ae23ab9efdd97d0a292c9e428c5f2dcebfe318d434ba1f7f04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10557 16892 bytes
font_02_sfnt_off00013150.bin
b9fd536fc8cf2c424018323aa4038d4586b6e2139e28459d0b6a3561399f6c59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13150 10752 bytes

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