Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6f04ba52565fa7…

MALICIOUS

PDF

82.1 KB Created: 2021-10-08 19:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6ca5a86c97f933e3f628e6aea584fae7 SHA-1: be323e270831a23d114f5064082c6539a436fad7 SHA-256: bf6f04ba52565fa7cc20053ef0f8b11d4931674cf0a592421020d94c91091638
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs and the nature of the heuristics strongly indicate a malicious intent to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ibshospitals.com/userfiles/file/zexuja.pdf In PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/35672949825.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/zejinarer.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/botsga7det5vb8m3uhu9ej5vd4/85449809176.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/43943252610.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/96653087022.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/288281421.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/14062659791.pdfIn PDF document text
    • http://zl369.net/userfiles/file/72517768515.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/31071902264.pdfIn PDF document text
    • https://papiratisk.cz/soubory/dutigaxoxoz.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/kotova.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/mogajinamo.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/mevisowipabupavi.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161408d6c8e16c---kutakolobopipeduruxupak.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/fugoteruj.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161563419cba59---jubutigokavusalosib.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/24008614019.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/mugojigiwolazo.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/kabidefelezesadipusit.pdfIn PDF document text
    • http://compsult.net/userfiles/file/32908362801.pdfIn PDF document text
    • http://nessium.net/userfiles/file/nosanazufevitulidoz.pdfIn PDF document text
    • http://sushibelovo.ru/files/tegojedinos.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b62663a229---bugalag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=king+midas+and+the+golden+touch+mythPDF 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_off0000dad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD3 18144 bytes
SHA-256: 6ba6feee9f571bd41499767414c4325915f5ac0606fb9eda96bf965cfb507c62
font_01_sfnt_off00010978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10978 10924 bytes
SHA-256: 5aa3009b60a2f59d35e7c071044c8d55542b09d2ca18fd3f11f9b81c57cfc407
font_02_sfnt_off00012261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12261 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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