Malicious PDF — malware analysis report

Static analysis result for SHA-256 384c9d9ea9022b89…

MALICIOUS

PDF

79.5 KB Created: 2021-09-21 00:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 46e67c2bbef0833307cb0989643bbdd9 SHA-1: 321c0a7f3e025758cde348b8b981b99665ab8941 SHA-256: 384c9d9ea9022b892042bf1f5f3b80715425eade5f66fb8c74f629c281ea3a91
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm and was identified as malicious by ML classifiers and ClamAV. The embedded URLs, such as http://idrogastermoclima.it/Utentifile/FCKPage/file/rezinetolajenatozakoxagi.pdf, suggest an attempt to redirect users to potentially harmful content. The presence of a link farm indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://idrogastermoclima.it/Utentifile/FCKPage/file/rezinetolajenatozakoxagi.pdf In PDF document text
    • http://asqcert.net/files/files/13691432470.pdfIn PDF document text
    • https://chineseclothingonline.com/File/71860797341.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/40294785864.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/sigabigeretosivizedema.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/getowusagisi.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/41003571144.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/gazakevevoset.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/rexazaziloniwubabib.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/edpl11b4oudb8mloebnlfagrpt/zewaribonesanupol.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/faea33e31ad3fd1920562dd07ab4e39c/damisilesomixepirizulur.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/29898967554.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd755ead29---88816570342.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/9218623261.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613630602bde2---69889224397.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/dosudomuzadutizeko.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/nadujafofezowakija.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/xemitikezoki.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/niketusugoxat.pdfIn PDF document text
    • https://btegypt.com/file/73020259379.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/55fe39e15afacc9cf798222807c9903e/rulidu.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/39924038834.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/79928248949.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161355744c95b9---39948230178.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/99555934412.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/41876931805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=beny+tv+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_off0000d505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD505 16988 bytes
SHA-256: 48bb38b07101f54f482664d63aa3ac901863ca80c9d2c05b65a208ee52d05370
font_01_sfnt_off000100af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C6 10436 bytes
SHA-256: 3b73ac6968ef0e96007fcfff3dcc0c7b6104b70ab302082454afe8ce1e72c9cb

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