Malicious PDF — malware analysis report

Static analysis result for SHA-256 1854515400dca0ee…

MALICIOUS

PDF

76.0 KB Created: 2021-09-08 11:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d2909200c970bb87394976504697a940 SHA-1: a887c2914592a71db8443cbdf1444970a7ad06bc SHA-256: 1854515400dca0ee1295aca48a280529840551b66d36ab558a3701772569c0f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.jaegeraviation.com/ckfinder/userfiles/files/fejiri.pdf In PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/2b1ad3d970642910c3d7ca7e7c5fbc85/febutejera.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f95c1df01---94057930753.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a06338af744---29083723328.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/bulagivofogovola.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/jeguri.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28e485762b---gofosebulena.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/88156819430.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/53371308535.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/311db2389833021afd032752d053ba02/2224886084.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/sutofezanivunuziwi.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/77853846630.pdfIn PDF document text
    • http://njxinbell.com/upload/files/zozuwosotaloxelabinixel.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/86588461705.pdfIn PDF document text
    • https://salwangurugram.com/files/munojopedoxofuvuvasaresas.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/mufuzobazoboligikid.pdfIn PDF document text
    • http://chhsclassof70.com/clients/1/1f/1f6d1b94cf555b90b9f410dfa82aea5f/File/tejipejelawuwowemoworam.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/89e756d4354bcb78a73ae0265d9939a5/dufodunovexewix.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/61180214924.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090f6dbc09c9---rugibizazafomiwi.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/86475755869.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/48593990506.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/gilis.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16111681e96818---88237623236.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5671f66da5---10131107611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=duff+%26+phelps+valuation+handbook+2017+pdfPDF 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_off0000ca5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5A 9280 bytes
SHA-256: 956fbae02cea35b8c2356b83a1b8d321498e581066ab9b7a1e4218412f229cbf
font_01_sfnt_off0000ddf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 17492 bytes
SHA-256: 50bc5ad18d0021c1f0c2e0a633bfc99bae3b8bdbf04cb556cfca0cb30fbd435f