Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c38896156791ab…

MALICIOUS

PDF

73.6 KB Created: 2021-10-05 00:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ea565c541b4d30ac568f90e1a56d6fd0 SHA-1: ac2ef179d93098c148152386745dc5f76b779090 SHA-256: 54c38896156791ab32bae509596d7914e6d1c3cfde13b7c35050cf2892071a2b
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on disposable or compromised infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of 'utm_term_redirector=True' suggests an attempt to manipulate search engine results or user tracking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://happyland-nsk.net/ckfinder/userfiles/files/75303191615.pdf In PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/23736740680.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b31132adaa---dogorulofutafisufif.pdfIn PDF document text
    • http://okudshava.ru/userfiles/file/17274242206.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e428ff0185---8558817740.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/99566171472.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/zirejomakonosonidup.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/9644227836158b7648e359.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/voxemixapinagowexisizap.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/95766068004.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/rebemuzugofav.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/feranomubunomidupik.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/vavalazawak.pdfIn PDF document text
    • http://asfalon.com/__files/file/vabodefivolejifapekisu.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/magabidodos.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/kosar.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/62856757643.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139c1d5b2b80---nowupewe.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/tepufegepibafabetov.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/13101056228.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/fogifibow.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/29901697854.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/rataxizumu.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/12944700556.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/32552143710.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16155679a77d4e---kedonowepeseseg.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/digawidagimuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+download+apk+downloaderPDF 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_off0000c027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC027 15908 bytes
SHA-256: fda8c36f357ce63bdbd84b16792d671c4368e1c5d7e5284482c2be16cd8c728b
font_01_sfnt_off0000e910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE910 10296 bytes
SHA-256: f85f3c9f7e62f7ff2f26e7d1abb257efa45053c0a62693459d20c26f84145cda
font_02_sfnt_off00010061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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