Malicious PDF — malware analysis report

Static analysis result for SHA-256 533f898226e9d61b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 13:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 816b0303c6294539af849175f0ef0d9e SHA-1: 0bc0e7d47850435912c9637ed856a89c8f3d7d18 SHA-256: 533f898226e9d61b9ae613a4a6fa5b4cefe54bee2edb209639c844f9b95f210e
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads or disposable hosting, suggesting a phishing or redirection scheme. The presence of numerous PDF_URI heuristics further supports the malicious intent of directing users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://solidpractise.com/files/userfiles/file/16688755025.pdf In PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/sokitakozene.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/78161770042.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/kazejosepaguvijopum.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/jepirewizi.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/jidatidupi.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/9769065695.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/17233476910.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/lotejo.pdfIn PDF document text
    • http://www.memoriahistoricamalaga.org/ckfinder/userfiles/files/75580908184.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210912015107.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138fe2a298fd---mexalofugositulazapav.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140f8ad522e2---vozejijukofuvomivus.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/61027881994.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/bajaladowototuwekogovaje.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/68865141475.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/5519813178.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/74155733958.pdfIn PDF document text
    • https://mcsfood.com/images/file/44592151728.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/97d1269d60ef75cb984267e00a4992dc/14902465161.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/piwanewifeneb.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/10113739387.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136c7920377e---pimujazajatakijuluvegekid.pdfIn PDF document text
    • https://fuoriscena.eu/file/dikarujubokarowajijigebaf.pdfIn PDF document text
    • http://steinemann-ag.ru/xokexijo.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/tigomijifufuxak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=dawn+break+night+witch+apkPDF 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_off0000d878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD878 10640 bytes
SHA-256: 74e6919aac319dd11a0bc5af06547de2c6a01e3f88de0630502438a325539aeb
font_01_sfnt_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 18964 bytes
SHA-256: 685a0fee054b179ff24afbdf42130a07500f16a80819800995231be7f485c855
font_02_sfnt_off000121f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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