Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b0ce2d64824354…

MALICIOUS

PDF

85.8 KB Created: 2021-07-02 19:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 473205514e17da98b697834001507663 SHA-1: e476793b9d2b254d03b9a4878a4ec2904bdb2ea0 SHA-256: 33b0ce2d64824354ddfc67cda0663ed6eae94424485130a3a652b0867f68bf79
104 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm pointing to compromised CMS uploads and disposable hosting. The document body was unreadable, but the presence of numerous embedded URLs and the 'link farm' heuristic suggest the primary purpose is to redirect users to potentially malicious or SEO-abused websites. The 'urgency lure' heuristic, though low-signal on its own, further supports a deceptive intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://airbays.com/userfiles/file/wupegiwuzolo.pdf In PDF document text
    • http://4grd.com/cmsimages/file/dagenirirakiniwulevino.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087951ecf519---dosig.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/338a978559476734e1df9cf624484c24/28932077619.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c67c30098---85633666008.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bbf779175---nomevemuxujirijomaw.pdfIn PDF document text
    • http://maihome.hu/admin1/file/sejijozusadefokaliruge.pdfIn PDF document text
    • https://actorconseil.com/files/file/52991310786.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ftbk5pvbke5e5t9n9111d06nfv/49738299274.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/2f92ce9ebb9f419260cec7575d30b0a6/jidil.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5adeb8c3d---93321522718.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/sipijuzulewu.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/80d46e8cdc014a0006412eb0435344a5/71618318097.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/66970366015.pdfIn PDF document text
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/45055947976.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/tifubumofazixupiloxaf.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/7e86ilsh2v97rfl8khm80219nt/dojajurezolubuf.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a09cdbf8b---18796176415.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/43654943131.pdfIn PDF document text
    • https://camelcarpet.org/d/files/72647674190.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/b66c25660ec73af71fc6f4563e1c834b/fodikoxululozofe.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/nisota.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ovi8di0s5r0938qhnhf09docc5/wopopogugetelar.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/newowewakudetijukolefaj.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f1df56c41---46482410538.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/jinomuvavejewiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=america+trivia+questions+and+answersPDF 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_off0000ea7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 10864 bytes
SHA-256: 9817f2cad53eb3688fa7cd123de595e5e985859eb29bacab36bca791235f7ae3
font_01_sfnt_off00010376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10376 17688 bytes
SHA-256: 81c442162f9a71a52dfafe27b4e4d2f9867175c9823098fc1b052c1f0be0b2ca
font_02_sfnt_off00013181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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