Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b44fd1d9ee1250…

MALICIOUS

PDF

84.1 KB Created: 2021-09-14 05:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f9d42b30a9e5acb362dfa892d2dd0606 SHA-1: 8230a7f9ae02bec1cebff326d3741f2fd7913885 SHA-256: c5b44fd1d9ee12505915c110d8d04528a18b7de67d2a335cad1bc8648d872776
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm or phishing lure. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading further malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://arcos-eff.it/userfiles/files/69513426800.pdf In PDF document text
    • http://mamolenasnc.it/userfiles/files/4520930461.pdfIn PDF document text
    • https://led7.ru/file/wukulurijifekuxabed.pdfIn PDF document text
    • http://methese.com/upload/files/94811843300.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109130627152754.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/zuropo.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/wapekegigutu.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/berilofimu.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/mubupu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8dc244392---silofapazobumaki.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/45578065477.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0d984d774d4e720036af1e1b923abb88/24771298095.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/50633667056.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/4515084654.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/buzajimafenonebuxuja.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/1817149783.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/xabobofawexolebexinaxem.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326189c5d8d---fugumajidoji.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0c04dcfc0---kojafitebebiwusemum.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/79010426896.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/burade.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/tasupixubukuguramuxegul.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/jejasukovofujelajefekebi.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/fipevalijuxaz.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/vozolugis.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/78340545845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=mini+militia+multiplayer+apk+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE492 10772 bytes
SHA-256: d8112560eaa9c3113995126d6267e8c83d82e85141ed47e4c104cc947f07e838
font_01_sfnt_off0000fd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 17272 bytes
SHA-256: 2bbfba7121823b35c9df41f07c74de65384050328cc90cc2dc1da2d04c495442
font_02_sfnt_off000129ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1