Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a12248e5b487ac…

MALICIOUS

PDF

83.7 KB Created: 2021-09-17 04:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a9ea66683ff8b09583b00bd57d7f054 SHA-1: d3c58772e39626a088bca9a9bbfcdb0ae07f0c00 SHA-256: 14a12248e5b487ac7587feff2bf725de819cdde95a67e13e8fb1b4861253af31
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple links pointing to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of a link farm on disposable hosting further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302fd0efc09---likadamid.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1d4a2e883---12947154626.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/2bbafc07762cd978329c33e90338d44e/43536347495.pdf
    • http://ckm-machinery.com/userfiles/files/semugelape.pdf
    • https://machinex-machines.com/UserFiles/File/sedavoxobizodopod.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161402b8827bbc---lenetan.pdf
    • http://selfmadefilms.nl/userfiles/files/darorinadaz.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f6cc4fdb3---66646492410.pdf
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79642893044.pdf
    • http://scouttautomotive.com/editor_uploads/system/files/milusodudejikexegetumof.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/berubakilavipu.pdf
    • https://ngonluathan.vn/images/ckeditor/files/dulido.pdf
    • http://cpk.by/ckfinder/userfiles/files/dosodapisumifumataseb.pdf
    • https://rubenferro.com/userfiles/file/33107160825.pdf
    • http://sys-svinding.dk/userfiles/file/7005484250.pdf
    • http://aadcnfgl.netsociality.com/upload/files/8927670144.pdf
    • http://oralrem.kz/ckfinder/userfiles/files/11343215492.pdf
    • http://ikuma-car.com/js/upload/files/97568995332.pdf
    • https://hoangmailogistics.com/asset/site/files/7473836110.pdf
    • http://solo-reisen.com/media/images/file/76167843627.pdf
    • http://www.jindatunnel.com/up_files/file/vatuwinerimutugexexokazi.pdf
    • https://tainandentist.com/uploads/files/202109100127466550.pdf
    • http://arsvet.ru/img/upload/dixozepalajo.pdf
    • https://kisikana.hr/userfiles/file/72964599080.pdf
    • https://tcremich.lu/files/files/zejesetobo.pdf
    • https://triangle-electronics.com/assets/userfiles/file/74840449384.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=angry+birds+space+full+apk
    • 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_off0000de63.bin
0567ba58d4e77446e5af1f5b17e26cc16aa4110452952f6be580b26ac3acc2ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE63 11004 bytes
font_01_sfnt_off0000f7a9.bin
a19d1ec8e3e1ed4133f2773e19a6b6fe56819bc713d38bf74937bca1943622d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A9 18272 bytes
font_02_sfnt_off0001277b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1277B 16792 bytes