Malicious PDF — malware analysis report

Static analysis result for SHA-256 a733312cdbcce6ff…

MALICIOUS

PDF

73.4 KB Created: 2021-09-01 12:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ff86c744d12c46d20689f9874931775e SHA-1: b98c567736a8cb98e92a91f056e1317899d982b2 SHA-256: a733312cdbcce6ffcca65e5108860cdee53f9fb1fa802bcc9bc34fb2314e7c3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://merlegdoktor.hu/tmp/zalutobu.pdf In PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/n0qj32dcv05s02traihctr1cng/85381046590.pdfIn PDF document text
    • https://vestol.bg/files/file/gopugoti.pdfIn PDF document text
    • http://talleresjpg.es/img/file/83339876595.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/ruvamerisurilixare.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/490bef158646d19b723544f6d40ba3aa/11923989871.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/wepefobewilubibakeje.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56473624731.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ji4jpl74ae89q2vp8uflcrl9up/bexujonawafofajux.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/61224316750.pdfIn PDF document text
    • https://x-software.cz/data/file/xomisibosapatafarujoje.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c75fe33f2e---53422148209.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/43723514752.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/juwapuzulaxumebasok.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/vufaxuw.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/mikesulideledan.pdfIn PDF document text
    • http://mlight.cz/archiv/file/xewofunarukamewowe.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be3d382ef71---50078506736.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/kogevujinuxo.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/mokawusif.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91471609218.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/segaxalejakanuzudawune.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/kowomamika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=finding+dory+read+alongPDF 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_off0000bcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD3 10248 bytes
SHA-256: a5153107c252a894fdef20c276657748af3096f03ee24897dacaf6210bcd090a
font_01_sfnt_off0000d3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A9 17072 bytes
SHA-256: 24ef6b94910359c9379f2452a621171d253ae359809150ead00421d226467145
font_02_sfnt_off0001000c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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