Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b6846f8fdfb20e…

MALICIOUS

PDF

74.7 KB Created: 2021-09-28 07:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: f44ace29200414479bf97ff246e079e8 SHA-1: 74bba4b32b9613cb30a99d663622b2f262fa7292 SHA-256: 66b6846f8fdfb20ec4e0ca7eca2b3d1ea432a295f66484b85520e84e46a773c7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm pointing to compromised WordPress sites. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further compromise or phishing. The document body is heavily obfuscated, preventing a clear understanding of its direct lure, but the overall pattern points to a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecead0acae---12371595009.pdf In PDF document text
    • http://captaincook.hu/userfiles/file/lejupisa.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/cdd512a366c253686d3cd24fcb149171/13091174239.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/66a7e58802107d9a4c9794bd3c596a3b/85082729457.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/65692800786.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/99769985536.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/taxizozonegu.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/veregijepamilen.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/jijuduvafikejozivow.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/84403013392.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/62953308560.pdfIn PDF document text
    • https://agermag.ro/mm/file/93880068687.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/25700142412.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/jovugeziwudonesutefapenun.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/desijulakudepa.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/verigosimisudigesutoren.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/faburomukig.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/gakoxomokujagigur.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/5856876297.pdfIn PDF document text
    • https://thehouseproduction.net/file/15947159687.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/limajevodoxolo.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/92541394121.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/dawujusuxosu.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///73624403693.pdfIn PDF document text
    • http://husplaza.hu/editor_up/42957906933.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/jafoxarijaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=jogo+medalha+de+honra+para+celular+androidPDF 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_off0000b9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C0 19560 bytes
SHA-256: 811357dd853046e62a5f5c1a3871171387c7120fdbdcd42edd944da6b3e14b08
font_01_sfnt_off0000eae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FC 10784 bytes
SHA-256: abe2e299dca8e00b9b2531b1cea282d440e762751ce2b0052c6e08bf7ee43f08

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